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

config.c

@@ -2200,7 +2200,7 @@ static struct {
 	size_t *offset;
 	unsigned int offset_alloc;
 	enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
-	int seen;
+	unsigned int seen;
 } store;
 
 static int matches(const char *key, const char *value)