staging: r8188eu: clean up rtl8188e_sreset_linked_status_check

Clean up the rtl8188e_sreset_linked_status_check, which has just
been moved to rtw_mlme_ext.

Don't initialise variables to 0 if the first access sets a new value.

Check the value of fw_status only once.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211212185833.22000-4-martin@kaiser.cx


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