video: fbdev: w100fb: Fix a potential double free.

Some memory is vmalloc'ed in the 'w100fb_save_vidmem' function and freed in
the 'w100fb_restore_vidmem' function. (these functions are called
respectively from the 'suspend' and the 'resume' functions)

However, it is also freed in the 'remove' function.

In order to avoid a potential double free, set the corresponding pointer
to NULL once freed in the 'w100fb_restore_vidmem' function.

Fixes: aac51f09d96a ("[PATCH] w100fb: Rewrite for platform independence")
Cc: Richard Purdie <[email protected]>
Cc: Antonino Daplas <[email protected]>
Cc: Bartlomiej Zolnierkiewicz <[email protected]>
Cc: <[email protected]> # v2.6.14+
Signed-off-by: Christophe JAILLET <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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