cangen: sort getopt() by order of option in usage

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

cangen.c

@@ -182,13 +182,9 @@ int main(int argc, char **argv)
 	signal(SIGHUP, sigterm);
 	signal(SIGINT, sigterm);
 
-	while ((opt = getopt(argc, argv, "ig:ebEfmI:L:D:xp:n:c:vR8h?")) != -1) {
+	while ((opt = getopt(argc, argv, "g:efbER8mI:L:D:p:n:ixc:vh?")) != -1) {
 		switch (opt) {
 
-		case 'i':
-			ignore_enobufs = 1;
-			break;
-
 		case 'g':
 			gap = strtod(optarg, NULL);
 			break;
@@ -211,6 +207,14 @@ int main(int argc, char **argv)
 			canfd = 1;
 			break;
 
+		case 'R':
+			rtr_frame = 1;
+			break;
+
+		case '8':
+			len8_dlc = 1;
+			break;
+
 		case 'm':
 			mix = 1;
 			canfd = 1; /* to switch the socket into CAN FD mode */
@@ -256,26 +260,6 @@ int main(int argc, char **argv)
 			}
 			break;
 
-		case 'c':
-			burst_count = strtoul(optarg, NULL, 10);
-			break;
-
-		case 'v':
-			verbose++;
-			break;
-
-		case 'x':
-			loopback_disable = 1;
-			break;
-
-		case 'R':
-			rtr_frame = 1;
-			break;
-
-		case '8':
-			len8_dlc = 1;
-			break;
-
 		case 'p':
 			polltimeout = strtoul(optarg, NULL, 10);
 			break;
@@ -288,6 +272,22 @@ int main(int argc, char **argv)
 			}
 			break;
 
+		case 'i':
+			ignore_enobufs = 1;
+			break;
+
+		case 'x':
+			loopback_disable = 1;
+			break;
+
+		case 'c':
+			burst_count = strtoul(optarg, NULL, 10);
+			break;
+
+		case 'v':
+			verbose++;
+			break;
+
 		case '?':
 		case 'h':
 		default: