staging: rtl8192e: Remove checks of pointer to stop_send.. and rtllib_..

staging: rtl8192e: Remove checks of pointer to stop_send.. and rtllib_..

Function pointers of stop_send_beacons and rtllib_ips_leave_wq is set
while executing the probe function. Therefore a NULL pointer check is
not required. Remove checks as it is dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/f12e9167499344059f77991d2058c050bbe744d2.1677345331.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>