bootloader+firmware: call shutdown instead of inf-loop after main is finished

embed/bootloader/main.c

@@ -281,7 +281,7 @@ int main(void)
     // start the bootloader if user touched the screen or no firmware installed
     if (touched || !vendor_parse_header((const uint8_t *)FIRMWARE_START, &vhdr)) {
         if (!bootloader_loop()) {
-            shutdown();
+            return 1;
         }
     }
 

embed/bootloader/startup.s

@@ -36,7 +36,6 @@ reset_handler:
   // enter the application code
   bl main
 
-  // loop forever if the application code returns
-  b .
+  b shutdown
 
   .end

embed/firmware/startup.s

@@ -36,7 +36,6 @@ reset_handler:
   // enter the application code
   bl main
 
-  // loop forever if the application code returns
-  b .
+  b shutdown
 
   .end