libblkid: udf: Fix parsing UDF revision

UDF revision is stored as decimal number in hexadecimal format.
E.g. number 0x0150 is revision 1.50, number 0x0201 is revision 2.01.

Apparently all UDF test images have number which has same representation in
decimal and hexadecimal format, so problem was not detected.

This patch adds new test image with UDF revision 1.50. Internally number is
stored as 0x0150. In decimal format it is (incorrectly) 1.80, but in
hexadecimal correct 1.50.

$ dd if=/dev/zero of=udf-hdd-mkudffs-1.3-8.img bs=1M count=10
$ mkudffs -r 0x150 -b 512 udf-hdd-mkudffs-1.3-8.img

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>

libblkid/src/superblocks/udf.c

@@ -450,7 +450,9 @@ real_blksz:
 	}
 
 	if (udf_rev)
-		blkid_probe_sprintf_version(pr, "%d.%02d", (int)(udf_rev >> 8), (int)(udf_rev & 0xFF));
+		/* UDF revision is stored as decimal number in hexadecimal format.
+		 * E.g. number 0x0150 is revision 1.50, number 0x0201 is revision 2.01. */
+		blkid_probe_sprintf_version(pr, "%x.%02x", (unsigned int)(udf_rev >> 8), (unsigned int)(udf_rev & 0xFF));
 
 	return 0;
 }

tests/expected/blkid/low-probe-udf-hdd-mkudffs-1.3-8

@@ -0,0 +1,10 @@
+ID_FS_LABEL=LinuxUDF
+ID_FS_LABEL_ENC=LinuxUDF
+ID_FS_LOGICAL_VOLUME_ID=LinuxUDF
+ID_FS_TYPE=udf
+ID_FS_USAGE=filesystem
+ID_FS_UUID=5a11940936fe76a8
+ID_FS_UUID_ENC=5a11940936fe76a8
+ID_FS_VERSION=1.50
+ID_FS_VOLUME_ID=LinuxUDF
+ID_FS_VOLUME_SET_ID=5a11940936fe76a8LinuxUDF