-fsanitize=address related compiler assisted debugging

file_previews.c

@@ -33,6 +33,7 @@ char* get_mimetype(char *path){
 	FILE *cmd_open = popen(cmd, "r");
 	char *line = NULL;
 	size_t size = 0;
+	free(cmd);
 	if (getline(&line, &size, cmd_open) != -1){
 		pclose(cmd_open);
 		return line;