serprog.c: Avoid calling memcpy with NULL pointer arguments

In function sp_stream_buffer_op, the variable parms might be NULL when
passed to memcpy. Although, since parmlen is also 0 at that time I
don't think it would make much difference. Still, add a NULL check
before calling memcpy to be safe.

Change-Id: I850123237e328f9548ba7f77a01888be2cbc9e7b
Signed-off-by: Aarya Chaumal <aarya.chaumal@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/62726
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-by: Thomas Heijligen <src@posteo.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>

0 files changed, 0 insertions, 0 deletions