gen-helper script: bail on failure

va416xx/gen-helper.sh

@@ -16,6 +16,11 @@ if [ -x "$(${svd2rust_bin} --version)" ]; then
 	exit
 fi
 ${svd2rust_bin} -i svd/va416xx-base.svd
+result=$?
+if [ $result -ne 0 ]; then
+  echo "svd2rust failed with code $result"
+  exit
+fi
 rm -rf src
 form -i lib.rs -o src/ && rm lib.rs
 cargo fmt

va416xx/svd/va416xx-base.svd

@@ -12871,4 +12871,4 @@ the counter from the value in the WDOGLOAD Register</description>
       </registers>
     </peripheral> 	
   </peripherals>
-</device>
+</device>