staging: rtl8723au: Use kmemdup() instead of memcpy() to duplicate memory

This issue was reported by coccicheck using the semantic patch
at scripts/coccinelle/api/memdup.cocci, and tested by compilation.

Signed-off-by: Benoit Taine <benoit.taine@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/rtl8723au/hal/rtl8723a_hal_init.c
Simple merge

diff --cc drivers/staging/rtl8723au/os_dep/ioctl_cfg80211.c
Simple merge