fix "format not a string literal" warnings

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

mii-tool.c

@@ -271,7 +271,7 @@ int show_basic_mii(int sock, int phy_id)
 
     if (opt_watch) {
 	if (opt_log) {
-	    syslog(LOG_INFO, buf);
+	    syslog(LOG_INFO, "%s", buf);
 	} else {
 	    char s[20];
 	    time_t t = time(NULL);

rarp.c

@@ -226,7 +226,7 @@ int main(int argc, char **argv)
 	case 'h':
 	    usage();
 	case 'V':
-	    fprintf(stderr, version_string);
+	    fputs(version_string, stderr);
 	    exit(E_VERSION);
 	    break;
 	case 'v':

slattach.c

@@ -569,7 +569,7 @@ usage(void)
 	  "[-c cmd] [-s speed] [-p protocol] tty | -\n"
 	  "       slattach -V | --version\n";
 
-  fprintf(stderr, usage_msg);
+  fputs(usage_msg, stderr);
   exit(1);
 }