Print usage of udevcontrol when no or invalid command is given

index 8add09e..60d21d2 100644
@@ -33,6 +33,9 @@ #include <sys/un.h>
 #include "udev.h"
 #include "udevd.h"
 
+/* prototypes */
+void usage(void);
+
 /* global variables */
 static int sock = -1;
 static int udev_log = 0;

@@ -51,6 +54,16 @@ void log_message (int priority, const ch
 }
 #endif
 
+void usage(void)
+{
+	printf("Usage: udevcontrol COMMAND\n"
+		"  log_priority=<level> set the udev log level for the daemon\n"
+		"  stop_exec_queue      keep udevd from executing events, queue only\n"
+		"  start_exec_queue     execute events, flush queue\n"
+		"  reload_rules         reloads the rules files\n"
+		"  max_childs=<N>       maximum number of childs running at the same time\n"
+		"  --help               print this help text\n\n");
+}
 
 int main(int argc, char *argv[], char *envp[])
 {

@@ -72,6 +85,7 @@ int main(int argc, char *argv[], char *e
 
 	if (argc < 2) {
 		fprintf(stderr, "missing command\n\n");
+		usage();
 		goto exit;
 	}
 

@@ -100,23 +114,18 @@ int main(int argc, char *argv[], char *e
 			*intval = atoi(val);
 			info("send max_childs=%i", *intval);
 		} else if (strcmp(arg, "help") = 0  || strcmp(arg, "--help") = 0  || strcmp(arg, "-h") = 0) {
-			printf("Usage: udevcontrol COMMAND\n"
-				"  log_priority=<level> set the udev log level for the daemon\n"
-				"  stop_exec_queue      keep udevd from executing events, queue only\n"
-				"  start_exec_queue     execute events, flush queue\n"
-				"  reload_rules         reloads the rules files\n"
-				"  max_childs=<N>       maximum number of childs running at the same time\n"
-				"  --help               print this help text\n\n");
-			exit(0);
+			usage();
+			goto exit;
 		} else {
 			fprintf(stderr, "unknown option\n\n");
-			exit(1);
+			usage();
+			goto exit;
 		}
 	}
 
 	if (getuid() != 0) {
 		fprintf(stderr, "need to be root, exit\n\n");
-		exit(1);
+		goto exit;
 	}
 
 	sock = socket(AF_LOCAL, SOCK_DGRAM, 0);