camcontrol: Plug a memory leak in getdevtree()

PR:		275338
MFC after:	1 week

(cherry picked from commit abfd031b48)

sbin/camcontrol/camcontrol.c

@@ -652,6 +652,7 @@ getdevtree(int argc, char **argv, char *combinedopt)
 	if (need_close)
 		fprintf(stdout, ")\n");
 
+	free(ccb.cdm.matches);
 	close(fd);
 
 	return (error);