ipaccess-config: Fix a resource leak in an error path

Fixes: Coverity CID 1040710, CID 1040711

openbsc/src/ipaccess/ipaccess-config.c

@@ -648,6 +648,7 @@ static int find_sw_load_params(const char *filename)
 	/* verify the file */
 	if (fstat(fd, &stat) == -1) {
 		perror("Can not stat the file");
+		close(fd);
 		return -1;
 	}