pack: move unuse_pack()

Signed-off-by: NJonathan Tan <jonathantanmy@google.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

cache.h

@@ -1639,7 +1639,6 @@ extern int odb_mkstemp(struct strbuf *template, const char *pattern);
  */
 extern int odb_pack_keep(const char *name);
 
-extern void unuse_pack(struct pack_window **);
 extern void clear_delta_base_cache(void);
 extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
 

packfile.c

@@ -596,3 +596,12 @@ unsigned char *use_pack(struct packed_git *p,
 		*left = win->len - xsize_t(offset);
 	return win->base + offset;
 }
+
+void unuse_pack(struct pack_window **w_cursor)
+{
+	struct pack_window *w = *w_cursor;
+	if (w) {
+		w->inuse_cnt--;
+		*w_cursor = NULL;
+	}
+}

packfile.h

@@ -45,6 +45,7 @@ extern void close_pack_index(struct packed_git *);
 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
 extern void close_pack_windows(struct packed_git *);
 extern void close_all_packs(void);
+extern void unuse_pack(struct pack_window **);
 
 extern void release_pack_memory(size_t);
 

sha1_file.c

@@ -719,15 +719,6 @@ void *xmmap(void *start, size_t length,
 	return ret;
 }
 
-void unuse_pack(struct pack_window **w_cursor)
-{
-	struct pack_window *w = *w_cursor;
-	if (w) {
-		w->inuse_cnt--;
-		*w_cursor = NULL;
-	}
-}
-
 static struct packed_git *alloc_packed_git(int extra)
 {
 	struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));