fixed typo in C++ snippets

snippets/cpp.snippets

@@ -3,8 +3,7 @@ snippet readfile
 	std::vector<char> v;
 	if (FILE *${2:fp} = fopen(${1:"filename"}, "r")) {
 		char buf[1024];
-		while (size_t len = 
-	fread(buf, 1, sizeof(buf), $2))
+		while (size_t len = fread(buf, 1, sizeof(buf), $2))
 			v.insert(v.end(), buf, buf + len);
 		fclose($2);
 	}${3}