staging: rtl8188eu: remove unneeded variable

The default value of status was _FAIL, it was only changed if kzalloc
succeeds and the check for status is immediately following kzalloc. We
can have the failure code in the else part as the failure code will be
executed only if kzalloc fails.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>