Fixed using myoptarg instead of optarg

Co-Authored-By: BazookaJoe1900 <BazookaJoe1900@gmail.com>

src/drivers/imu/adis16448/adis16448.cpp

@@ -1789,7 +1789,7 @@ adis16448_main(int argc, char *argv[])
 	while ((ch = px4_getopt(argc, argv, "R:", &myoptind, &myoptarg)) != EOF) {
 		switch (ch) {
 		case 'R':
-			rotation = (enum Rotation)atoi(optarg);
+			rotation = (enum Rotation)atoi(myoptarg);
 			break;
 
 		default: