main: Do not enter to usb mode if not needed

src/main2.c

@@ -712,6 +712,8 @@ int main(int argc, char **argv) {
 		}
 	}
 
+	if ( dev_boot || dev_reboot || dev_load || dev_flash || dev_cold_flash || dev_ident || set_root || set_usb || set_rd || set_rd_flags || set_hw || set_kernel || set_nolo || set_sw || set_emmc ) {
+
 		while ( image_first ) {
 
 			usb_dev = usb_open_and_wait_for_device();
@@ -750,6 +752,8 @@ int main(int argc, char **argv) {
 
 		}
 
+	}
+
 
 #endif