Fixed check method of $USE_GET_PIP

'[[ -n "$USE_GET_PIP" ]]' always TRUE
because $USE_GET_PIP is '0' or '1'.

Change-Id: I73c4c6befe2126882ef21991b2a3fe712b2ac388
Closes-Bug: #1259824
Merge "Fixed check method of $USE_GET_PIP"