hashmap.h: use 'unsigned int' for hash-codes everywhere

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/technical/api-hashmap.txt

@@ -80,7 +80,7 @@ prevent expensive resizing. If 0, the table is dynamically resized.
 If `free_entries` is true, each hashmap_entry in the map is freed as well
 (using stdlib's free()).
 
-`void hashmap_entry_init(void *entry, int hash)`::
+`void hashmap_entry_init(void *entry, unsigned int hash)`::
 
 	Initializes a hashmap_entry structure.
 +

hashmap.h

@@ -43,7 +43,7 @@ extern void hashmap_free(struct hashmap *map, int free_entries);
 
 /* hashmap_entry functions */
 
-static inline void hashmap_entry_init(void *entry, int hash)
+static inline void hashmap_entry_init(void *entry, unsigned int hash)
 {
 	struct hashmap_entry *e = entry;
 	e->hash = hash;