fs: iomap: Change the type of blocksize from 'int' to 'unsigned int' in iomap_file_buffered_write_punch_delalloc

The return value type of i_blocksize() is 'unsigned int', so the
type of blocksize has been modified from 'int' to 'unsigned int'
to ensure data type consistency.

Signed-off-by: Lu Hongfei <luhongfei@vivo.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

Author: Lu Hongfei

fs/iomap/buffered-io.c

@@ -1073,7 +1073,7 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode,
 {
 	loff_t			start_byte;
 	loff_t			end_byte;
-	int			blocksize = i_blocksize(inode);
+	unsigned int		blocksize = i_blocksize(inode);
 
 	if (iomap->type != IOMAP_DELALLOC)
 		return 0;