libblkid: fix sgi PT parser to report system partitions

... to be compatible with Linux kernel.

Signed-off-by: Karel Zak <kzak@redhat.com>

libblkid/src/partitions/sgi.c

@@ -52,8 +52,7 @@ static int probe_sgi_pt(blkid_probe pr,
 		uint32_t type = be32_to_cpu(p->type);
 		blkid_partition par;
 
-		if (size == 0 || type == SGI_TYPE_ENTIRE_DISK ||
-			         type == SGI_TYPE_VOLHDR) {
+		if (!size) {
 			blkid_partlist_increment_partno(ls);
 			continue;
 		}