Bug 1334979 - Fix a truncation leading to an error with gcc 7 r=bbouvier

MozReview-Commit-ID: Cw6h49cNetj

--HG--
extra : rebase_source : 36083f5b6e18c5990f5acc740e06139ef9b60016

toolkit/components/ctypes/tests/jsctypes-test-finalizer.cpp

@@ -232,8 +232,8 @@ test_finalizer_acq_string_t(int i)
 {
   gFinalizerTestResources[i] = 1;
   if (!gFinalizerTestNames[i]) {
-    char* buf = new char[10];
-    snprintf(buf, 10, "%d", i);
+    char* buf = new char[12];
+    snprintf(buf, 12, "%d", i);
     gFinalizerTestNames[i] = buf;
     return buf;
   }