Bug 819825, fix ICE/STUN crash on Android by null-checking setlocale(), r=abr

media/mtransport/third_party/nICEr/src/util/mbslen.c

@@ -91,9 +91,11 @@ mbslen(const char *s, size_t *ncharsp)
     if (!strstr(my_locale, "UTF-8"))
         ABORT(R_NOT_FOUND);
 #else
-        /* can't count UTF-8 characters with mbrlen if the locale isn't UTF-8 */
-        if (! strcasestr(setlocale(LC_CTYPE, 0), "UTF-8"))
-            ABORT(R_NOT_FOUND);
+    /* can't count UTF-8 characters with mbrlen if the locale isn't UTF-8 */
+    /* null-checking setlocale is required because Android */
+    char *locale = setlocale(LC_CTYPE, 0);
+    if (!locale || !strcasestr(locale, "UTF-8"))
+        ABORT(R_NOT_FOUND);
 #endif
 
 #ifdef DARWIN