staging: rtl8192e: rtl_core: Fix possible null-pointer dereference in _rtl92e_pci_dis...

staging: rtl8192e: rtl_core: Fix possible null-pointer dereference in _rtl92e_pci_disconnect()

The variable dev is checked in:
  if (dev)

This indicates that it can be NULL. If so, a null-pointer dereference will
occur:
  priv = rtllib_priv(dev);

However, the value of priv is not used in the remaining part of this
function. Thus the else-branch can be removed to fix this posible
null-pointer dereference.

Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tuo Li <islituo@gmail.com>
Link: https://lore.kernel.org/r/20210811031135.4110-1-islituo@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>