csum-file: define hashwrite's count as a uint32_t

We want to call this code from Rust and ensure that the types are the
same for compatibility, which is easiest to do if the type is a fixed
size.  Since unsigned int is 32 bits on all the platforms we care about,
define it as a uint32_t instead.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: bk2204

csum-file.c

@@ -110,7 +110,7 @@ void discard_hashfile(struct hashfile *f)
 	free_hashfile(f);
 }
 
-void hashwrite(struct hashfile *f, const void *buf, unsigned int count)
+void hashwrite(struct hashfile *f, const void *buf, uint32_t count)
 {
 	while (count) {
 		unsigned left = f->buffer_len - f->offset;

csum-file.h

@@ -63,7 +63,7 @@ void free_hashfile(struct hashfile *f);
  */
 int finalize_hashfile(struct hashfile *, unsigned char *, enum fsync_component, unsigned int);
 void discard_hashfile(struct hashfile *);
-void hashwrite(struct hashfile *, const void *, unsigned int);
+void hashwrite(struct hashfile *, const void *, uint32_t);
 void hashflush(struct hashfile *f);
 void crc32_begin(struct hashfile *);
 uint32_t crc32_end(struct hashfile *);