Change in flashrom[master]: cli_classic: fix memory leak

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Nikolai Artemiev, Joursoir.
Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/64351 )

Change subject: cli_classic: fix memory leak
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Patch Set 1:

(2 comments)

Patchset:

PS1: 
Joursoir, so glad to see you here, thanks for the patch!

File cli_classic.c:

https://review.coreboot.org/c/flashrom/+/64351/comment/8ebd0720_eee00a91 
PS1, Line 1103: if (set_wp_region && wp_region)
I am wondering whether this condition needed. Maybe we can just have one line
 free(wp_region);

I remember some time ago Angel explained to me that it is legit to call `free(pointer)` even if the pointer is null.
Angel, Nikolai, what do you think?