ext2: change return code to -ENOMEM when failing memory allocation

Change return code to -ENOMEM from -EINVAL when failing memory
allocation in fill_super(), meanwhile delete redundant initial
assignment of variable err.
Signed-off-by: NChengguang Xu <cgxu519@icloud.com>
Signed-off-by: NJan Kara <jack@suse.cz>

fs/ext2/super.c

@@ -827,7 +827,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 	unsigned long logic_sb_block;
 	unsigned long offset = 0;
 	unsigned long def_mount_opts;
-	long ret = -EINVAL;
+	long ret = -ENOMEM;
 	int blocksize = BLOCK_SIZE;
 	int db_count;
 	int i, j;
@@ -835,7 +835,6 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 	int err;
 	struct ext2_mount_options opts;
 
-	err = -ENOMEM;
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
 		goto failed;
@@ -851,6 +850,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_daxdev = dax_dev;
 
 	spin_lock_init(&sbi->s_lock);
+	ret = -EINVAL;
 
 	/*
 	 * See what the current blocksize for the device is, and