staging: rtl8192e: Remove unused variable p_intb

Remove unused variable p_intb of rtl92e_ack_irq.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/196f555d3762bf4fa8302f19b46f1510ea68cb31.1690615475.git.philipp.g.hortmann@gmail.com


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