Squash warnings

src/http.c

@@ -587,7 +587,6 @@ static void printdirentry(const char *name, void *userdata) {
     struct tm tm;
     if (flags & MG_FS_DIR) {
       snprintf(sz, sizeof(sz), "%s", "[DIR]");
-      size = -1;
     } else if (size < 1024) {
       snprintf(sz, sizeof(sz), "%d", (int) size);
     } else if (size < 0x100000) {
@@ -602,7 +601,8 @@ static void printdirentry(const char *name, void *userdata) {
     mg_printf(d->c,
               "  <tr><td><a href=\"%.*s%s\">%s%s</a></td>"
               "<td name=%lu>%s</td><td name=" MG_INT64_FMT ">%s</td></tr>\n",
-              n, path, slash, name, slash, (unsigned long) t, mod, size, sz);
+              n, path, slash, name, slash, (unsigned long) t, mod,
+              flags & MG_FS_DIR ? (int64_t) -1 : (int64_t) size, sz);
   }
 }