clang: warning fix for vmt.c

[Mark Kettenis]

Using a variable for the format string isn't a godd idea.

ok?


Index: dev/pv/vmt.c
===================================================================
RCS file: /cvs/src/sys/dev/pv/vmt.c,v
retrieving revision 1.9
diff -u -p -r1.9 vmt.c
--- dev/pv/vmt.c        3 Feb 2016 14:24:05 -0000       1.9
+++ dev/pv/vmt.c        24 Sep 2016 17:08:35 -0000
@@ -419,7 +419,7 @@ vmt_kvop(void *arg, int op, char *key, c
                goto done;
        }
 
-       if (vm_rpc_send_rpci_tx(sc, buf) != 0) {
+       if (vm_rpc_send_rpci_tx(sc, "%s", buf) != 0) {
                DPRINTF("%s: error sending command: %s\n", DEVNAME(sc), buf);
                sc->sc_rpc_error = 1;
                error = EIO;