libtcmu: fix max unmap definition

The comment says we wanted to limit the max UNMAP size to 32M but we
were setting the number of bytes instead of blocks, so we were setting
it to 16 GB.

Signed-off-by: Mike Christie <mchristi@redhat.com>

libtcmu_common.h

@@ -71,7 +71,7 @@ enum {
 #define CFGFS_MOD_PARAM CFGFS_TARGET_MOD"/parameters"
 
 /* Temporarily limit this to 32M */
-#define VPD_MAX_UNMAP_LBA_COUNT            (32 * 1024 * 1024)
+#define VPD_MAX_UNMAP_LBA_COUNT            65536
 #define VPD_MAX_UNMAP_BLOCK_DESC_COUNT     0x04
 /* Temporarily limit this is 0x1 */
 #define MAX_CAW_LENGTH                     0x01