fsprobe: Fix usage message

Fix the usage message to display the correct command name.

Change-Id: I886ebd45554d7e7eb6254fa59fa010fd78e5952a
Reviewed-on: http://gerrit.openafs.org/4398
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>

src/viced/fsprobe.c

@@ -69,7 +69,7 @@ main(int argc, char **argv)
 
     argc--, av++;
     if (argc < 1) {
-	printf("usage: pxclient <serverHost>\n");
+	printf("usage: fsprobe <serverHost>\n");
 	exit(1);
     }
     memset(&host, 0, sizeof(struct sockaddr_in));