lscpu: fix floating point exception

As the title tells this change indeed fixes floating point exception, but
post processing as value overwrite feels a wrong.  Possibly something in
input is making cpu set count to go wrong, but I could not get my head
around what could it be.  Anyway avoiding division by zero seems better than
crashing so lets do this atleast for now.

Caused-by: e5f721132e
Addresses: https://github.com/karelzak/util-linux/issues/788
Reported-by: Lars Wendler <polynomial-c@gentoo.org>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>

sys-utils/lscpu.c

@@ -1925,6 +1925,8 @@ static int get_cache_full_size(struct lscpu_desc *desc,
 	/* Correction for CPU threads */
 	if (desc->nthreads > desc->ncores)
 		nshares /= (desc->nthreads / desc->ncores);
+	if (nshares < 1)
+		nshares = 1;
 
 	*res = (desc->ncores / nshares) * ca->size;
 	return 0;

tests/expected/lscpu/lscpu-vmware_fpe

@@ -0,0 +1,76 @@
+CPU op-mode(s):                  32-bit, 64-bit
+Address sizes:                   48 bits physical, 48 bits virtual
+CPU(s):                          16
+On-line CPU(s) list:             0-15
+Thread(s) per core:              2
+Core(s) per socket:              4
+Socket(s):                       2
+NUMA node(s):                    4
+Vendor ID:                       AuthenticAMD
+CPU family:                      21
+Model:                           2
+Model name:                      AMD Opteron(tm) Processor 6328
+Stepping:                        0
+Frequency boost:                 enabled
+CPU MHz:                         1605.776
+CPU max MHz:                     3200.0000
+CPU min MHz:                     1400.0000
+BogoMIPS:                        6399.69
+Virtualization:                  AMD-V
+L1d cache:                       128 KiB
+L1i cache:                       512 KiB
+L2 cache:                        16 MiB
+L3 cache:                        24 MiB
+NUMA node0 CPU(s):               0-3
+NUMA node1 CPU(s):               4-7
+NUMA node2 CPU(s):               8-11
+NUMA node3 CPU(s):               12-15
+Vulnerability L1tf:              Not affected
+Vulnerability Mds:               Not affected
+Vulnerability Meltdown:          Not affected
+Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
+Vulnerability Spectre v1:        Mitigation; __user pointer sanitization
+Vulnerability Spectre v2:        Mitigation; Full AMD retpoline, IBPB conditional, STIBP disabled, RSB filling
+Flags:                           fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid amd_dcm aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb cpb hw_pstate ssbd ibpb vmmcall bmi1 arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
+
+# The following is the parsable format, which can be fed to other
+# programs. Each different item in every column has an unique ID
+# starting from zero.
+# CPU,Core,Socket,Node,,L1d,L1i,L2,L3
+0,0,0,0,,0,0,0,0
+1,0,0,0,,1,0,0,0
+2,1,0,0,,2,1,1,0
+3,1,0,0,,3,1,1,0
+4,2,0,1,,4,2,2,1
+5,2,0,1,,5,2,2,1
+6,3,0,1,,6,3,3,1
+7,3,0,1,,7,3,3,1
+8,4,1,2,,8,4,4,2
+9,4,1,2,,9,4,4,2
+10,5,1,2,,10,5,5,2
+11,5,1,2,,11,5,5,2
+12,6,1,3,,12,6,6,3
+13,6,1,3,,13,6,6,3
+14,7,1,3,,14,7,7,3
+15,7,1,3,,15,7,7,3
+
+# The following is the parsable format, which can be fed to other
+# programs. Each different item in every column has an unique ID
+# starting from zero.
+# CPU,Core,Socket,Node,,L1d,L1i,L2,L3
+0,0,0,0,,0,0,0,0
+1,1,0,0,,1,0,0,0
+2,2,0,0,,2,1,1,0
+3,3,0,0,,3,1,1,0
+4,0,0,1,,4,2,2,1
+5,1,0,1,,5,2,2,1
+6,2,0,1,,6,3,3,1
+7,3,0,1,,7,3,3,1
+8,0,1,2,,8,4,4,2
+9,1,1,2,,9,4,4,2
+10,2,1,2,,10,5,5,2
+11,3,1,2,,11,5,5,2
+12,0,1,3,,12,6,6,3
+13,1,1,3,,13,6,6,3
+14,2,1,3,,14,7,7,3
+15,3,1,3,,15,7,7,3