xfs: rename random32() to prandom_u32()

Use more preferable function name which implies using a pseudo-random
number generator.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: <bpm@sgi.com>
Cc: Ben Myers <bpm@sgi.com>
Cc: Alex Elder <elder@kernel.org>
Cc: xfs@oss.sgi.com
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_alloc.c

@@ -842,7 +842,7 @@ xfs_alloc_ag_vextent_near(
 	 */
 	int		dofirst;	/* set to do first algorithm */
 
-	dofirst = random32() & 1;
+	dofirst = prandom_u32() & 1;
 #endif
 
 restart:

fs/xfs/xfs_error.c

@@ -66,7 +66,7 @@ xfs_error_test(int error_tag, int *fsidp, char *expression,
 	int i;
 	int64_t fsid;
 
-	if (random32() % randfactor)
+	if (prandom_u32() % randfactor)
 		return 0;
 
 	memcpy(&fsid, fsidp, sizeof(xfs_fsid_t));

fs/xfs/xfs_ialloc.c

@@ -369,7 +369,7 @@ xfs_ialloc_ag_alloc(
 	 * number from being easily guessable.
 	 */
 	error = xfs_ialloc_inode_init(args.mp, tp, agno, args.agbno,
-			args.len, random32());
+			args.len, prandom_u32());
 
 	if (error)
 		return error;

fs/xfs/xfs_log.c

@@ -3485,7 +3485,7 @@ xlog_ticket_alloc(
 	tic->t_curr_res		= unit_bytes;
 	tic->t_cnt		= cnt;
 	tic->t_ocnt		= cnt;
-	tic->t_tid		= random32();
+	tic->t_tid		= prandom_u32();
 	tic->t_clientid		= client;
 	tic->t_flags		= XLOG_TIC_INITED;
 	tic->t_trans_type	= 0;