ext4: remove unnecessary NULL pointer check

brelse() and ext4_journal_force_commit() are both inlined and able
to handle NULL.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index dc0fb7b..aac5273 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4480,16 +4480,12 @@
 int ext4_force_commit(struct super_block *sb)
 {
 	journal_t *journal;
-	int ret = 0;
 
 	if (sb->s_flags & MS_RDONLY)
 		return 0;
 
 	journal = EXT4_SB(sb)->s_journal;
-	if (journal)
-		ret = ext4_journal_force_commit(journal);
-
-	return ret;
+	return ext4_journal_force_commit(journal);
 }
 
 static int ext4_sync_fs(struct super_block *sb, int wait)