mako: Fix the exit code in bt init script

exit_code_hci_qcomm_init was used but not defined. use $? as exit code

Change-Id: I751b646dc53214f9f3ac6464767899e4be0e63ab
diff --git a/init.mako.bt.sh b/init.mako.bt.sh
index 4fdd065..d3fc5f8 100644
--- a/init.mako.bt.sh
+++ b/init.mako.bt.sh
@@ -64,9 +64,9 @@
 
 case $? in
   0) logi "Bluetooth QSoC firmware download succeeded, $PWR_CLASS $BDADDR $TRANSPORT";;
-  *) failed "Bluetooth QSoC firmware download failed" $exit_code_hci_qcomm_init;
+  *) failed "Bluetooth QSoC firmware download failed" $?;
      setprop bluetooth.status off;
-     exit $exit_code_hci_qcomm_init;;
+     exit $?;;
 esac
 
 setprop bluetooth.status on