Merge branch 'rj/no-sign-compare'

Many codepaths have been updated to squelch -Wsign-compare
warnings.

* rj/no-sign-compare:
  ALLOC_GROW: avoid -Wsign-compare warnings
  cache.h: hex2chr() - avoid -Wsign-compare warnings
  commit-slab.h: avoid -Wsign-compare warnings
  git-compat-util.h: xsize_t() - avoid -Wsign-compare warnings

builtin/pack-objects.c

@@ -2563,8 +2563,8 @@ struct in_pack_object {
 };
 
 struct in_pack {
-	int alloc;
-	int nr;
+	unsigned int alloc;
+	unsigned int nr;
 	struct in_pack_object *array;
 };