staging: rtl8192e: Remove checks of pointer to handle_a.. and handle_b..

staging: rtl8192e: Remove checks of pointer to handle_a.. and handle_b..

Function pointers of handle_assoc_response and handle_beacon 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/5c0fd114c24616bc03271ccb0a72a6bc68e45d61.1677345331.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>