staging: r8188eu: rename _pFwHdr in IS_FW_HEADER_EXIST

Rename _pFwHdr in the macro IS_FW_HEADER_EXIST to avoid camel case.

_pFwHdr -> _fwhdr

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220107143617.2214-2-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>