cache,tree: move cmp_cache_name_compare from tree.[ch] to read-cache.c

Since cmp_cache_name_compare() was comparing cache_entry structs, it
was associated with the cache rather than with trees.  Move the
function.  As a side effect, we can make cache_name_stage_compare()
static as well.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -562,7 +562,7 @@ int base_name_compare(const char *name1, size_t len1, int mode1,
 int df_name_compare(const char *name1, size_t len1, int mode1,
 		    const char *name2, size_t len2, int mode2);
 int name_compare(const char *name1, size_t len1, const char *name2, size_t len2);
-int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
+int cmp_cache_name_compare(const void *a_, const void *b_);
 
 /* add */
 /*

read-cache.c

@@ -567,7 +567,8 @@ int name_compare(const char *name1, size_t len1, const char *name2, size_t len2)
 	return 0;
 }
 
-int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2)
+static int cache_name_stage_compare(const char *name1, int len1, int stage1,
+				    const char *name2, int len2, int stage2)
 {
 	int cmp;
 
@@ -582,6 +583,16 @@ int cache_name_stage_compare(const char *name1, int len1, int stage1, const char
 	return 0;
 }
 
+int cmp_cache_name_compare(const void *a_, const void *b_)
+{
+	const struct cache_entry *ce1, *ce2;
+
+	ce1 = *((const struct cache_entry **)a_);
+	ce2 = *((const struct cache_entry **)b_);
+	return cache_name_stage_compare(ce1->name, ce1->ce_namelen, ce_stage(ce1),
+				  ce2->name, ce2->ce_namelen, ce_stage(ce2));
+}
+
 static int index_name_stage_pos(struct index_state *istate,
 				const char *name, int namelen,
 				int stage,

tree.c

@@ -94,16 +94,6 @@ int read_tree(struct repository *r,
 	return ret;
 }
 
-int cmp_cache_name_compare(const void *a_, const void *b_)
-{
-	const struct cache_entry *ce1, *ce2;
-
-	ce1 = *((const struct cache_entry **)a_);
-	ce2 = *((const struct cache_entry **)b_);
-	return cache_name_stage_compare(ce1->name, ce1->ce_namelen, ce_stage(ce1),
-				  ce2->name, ce2->ce_namelen, ce_stage(ce2));
-}
-
 struct tree *lookup_tree(struct repository *r, const struct object_id *oid)
 {
 	struct object *obj = lookup_object(r, oid);

tree.h

@@ -29,7 +29,6 @@ void free_tree_buffer(struct tree *tree);
 /* Parses and returns the tree in the given ent, chasing tags and commits. */
 struct tree *parse_tree_indirect(const struct object_id *oid);
 
-int cmp_cache_name_compare(const void *a_, const void *b_);
 
 #define READ_TREE_RECURSIVE 1
 typedef int (*read_tree_fn_t)(const struct object_id *, struct strbuf *, const char *, unsigned int, void *);