Bug 1441038: Don't ignore return value of js_DumpCallgrind. r=jorendorff

MozReview-Commit-ID: 5aNmRAhDoZB

--HG--
extra : rebase_source : 585dc8830eaf49900f130efbc8ad28778b30cc20

js/src/builtin/Profilers.cpp

@@ -180,7 +180,7 @@ JS_DumpProfile(const char* outfile, const char* profileName)
 {
     bool ok = true;
 #ifdef MOZ_CALLGRIND
-    js_DumpCallgrind(outfile);
+    ok = js_DumpCallgrind(outfile);
 #endif
     return ok;
 }