Bug 565612 unreachable branch in js_InflateUTF8StringToBuffer. r=jorendorff

--HG--
extra : rebase_source : 64e41e13787b9a9c3cfb4faf987c6f6902293407

js/src/jsstr.cpp

@@ -3713,8 +3713,6 @@ js_InflateUTF8StringToBuffer(JSContext *cx, const char *src, size_t srclen,
                     }
                     return JS_FALSE;
                 }
-                if (dstlen < 2)
-                    goto bufferTooSmall;
                 if (dst) {
                     *dst++ = (jschar)((v >> 10) + 0xD800);
                     v = (jschar)((v & 0x3FF) + 0xDC00);