util: Remove unused macro

src/util.h

@@ -104,25 +104,6 @@ extern void git__strtolower(char *str);
 
 extern int git__fnmatch(const char *pattern, const char *name, int flags);
 
-/*
- * Realloc the buffer pointed at by variable 'x' so that it can hold
- * at least 'nr' entries; the number of entries currently allocated
- * is 'alloc', using the standard growing factor alloc_nr() macro.
- *
- * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
- */
-#define alloc_nr(x) (((x)+16)*3/2)
-#define ALLOC_GROW(x, nr, alloc) \
-	do { \
-		if ((nr) > alloc) { \
-			if (alloc_nr(alloc) < (nr)) \
-				alloc = (nr); \
-			else \
-				alloc = alloc_nr(alloc); \
-			x = xrealloc((x), alloc * sizeof(*(x))); \
-		} \
-	} while (0)
-
 extern void git__tsort(void **dst, size_t size, int (*cmp)(const void *, const void *));
 extern void **git__bsearch(const void *key, void **base, size_t nmemb,
 	int (*compar)(const void *, const void *));