Use a saner pool hash resize hint

- The previous size hint would actually cause us to shrink the hash
  bucket allocation, requiring the hash to resize itself immediately
  afterwards. As if the rehashes weren't expensive enough already...

rpmio/rpmstrpool.c

@@ -82,7 +82,7 @@ void rpmstrPoolUnfreeze(rpmstrPool pool)
 {
     if (pool) {
 	if (pool->hash == NULL) {
-	    int sizehint = (pool->offs_size / 2) - 1;
+	    int sizehint = pool->offs_size * 2;
 	    if (sizehint < STRHASH_INITSIZE)
 		sizehint = STRHASH_INITSIZE;
 	    pool->hash = strHashCreate(sizehint, rstrhash, strcmp, NULL, NULL);