Fix memory leak in getconf()

As getline() calls malloc() to allocate new memory
for our usage, we have to free() it after.

rdo.c

@@ -24,6 +24,7 @@ void getconf(FILE* fp, const char* entry, char* result, size_t len_result) {
 			if (token) {
 				strncpy(result, token, len_result);
 				result[strcspn(result, "\n")] = 0;
+				free(line);
 				return;
 			}
 		}