ext4: remove redundant variable err

Return value directly from ext4_group_extend_no_check()
instead of getting value from redundant variable err.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Jinpeng Cui <cui.jinpeng2@zte.com.cn>
Link: https://lore.kernel.org/r/20220831160843.305836-1-cui.jinpeng2@zte.com.cnSigned-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/resize.c

@@ -1831,7 +1831,6 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
 	ext4_grpblk_t last;
 	ext4_grpblk_t add;
 	struct buffer_head *bh;
-	int err;
 	ext4_group_t group;
 
 	o_blocks_count = ext4_blocks_count(es);
@@ -1886,8 +1885,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
 	}
 	brelse(bh);
 
-	err = ext4_group_extend_no_check(sb, o_blocks_count, add);
-	return err;
+	return ext4_group_extend_no_check(sb, o_blocks_count, add);
 } /* ext4_group_extend */