lyrics fetcher: fix a typo

src/lyrics_fetcher.cpp

@@ -221,7 +221,7 @@ void MetrolyricsFetcher::postProcess(std::string &data)
 {
 	// throw away [ from ... ] info
 	size_t i = data.find('['), j = data.find(']');
-	if (i != std::string::npos && i != std::string::npos)
+	if (i != std::string::npos && j != std::string::npos)
 		data.replace(i, j-i+1, "");
 	// some of lyrics have both \n chars and <br />, html tags
 	// are always present whereas \n chars are not, so we need to