Test for failure

src/freedombone-prep

@@ -161,6 +161,10 @@ if [ -f /usr/bin/sudo ]; then
     SUDO='sudo'
 fi
 $SUDO ./setup_sdcard.sh --mmc $MICROSD_DRIVE --dtb beaglebone
+if [ ! "$?" = "0" ]; then
+    echo 'System did not install to the microSD'
+    exit 4378
+fi
 
 echo ''
 echo ''