Fix murmurhash2 when string length is a multiple of a 4

The first h *= m after the loop should only happen for len % 4 != 0.

lib/std/hashfuncs.myr

@@ -121,17 +121,19 @@ const murmurhash2 = {data, seed
 	match data.len
 	| 3:
 		h ^= (data[2] : uint32) << 16
-		h ^= (data[1] : uint32) <<8
+		h ^= (data[1] : uint32) << 8
 		h ^= (data[0] : uint32)
+		h *= m
 	| 2:
-		h ^= (data[1] : uint32) <<8
+		h ^= (data[1] : uint32) << 8
 		h ^= (data[0] : uint32)
+		h *= m
 	| 1:
 		h ^= (data[0] : uint32)
+		h *= m
 	| 0:	/* nothing */
 	| _:	die("0 < len < 4 must be true")
 	;;
-	h *= m
 
 	h ^= h >> 13
 	h *= m

util/htab.c

@@ -322,10 +322,8 @@ murmurhash2 (void *ptr, size_t len)
 	case 3:	h ^= p[2] << 16;
 	case 2:	h ^= p[1] << 8;
 	case 1:	h ^= p[0] << 0;
-	default:
-		break;
-	};
-	h *= m;
+		h *= m;
+	}
 
 	h ^= h >> 13;
 	h *= m;