fbdev: efifb: Fix a use-after-free due early fb_info cleanup

Commit d258d00fb9c7 ("fbdev: efifb: Cleanup fb_info in .fb_destroy rather
than .remove") attempted to fix a use-after-free error due driver freeing
the fb_info in the .remove handler instead of doing it in .fb_destroy.

But ironically that change introduced yet another use-after-free since the
fb_info was still used after the free.

This should fix for good by freeing the fb_info at the end of the handler.

Fixes: d258d00fb9c7 ("fbdev: efifb: Cleanup fb_info in .fb_destroy rather than .remove")
Reported-by: Ville Syrjälä <[email protected]>
Reported-by: Andrzej Hajda <[email protected]>
Signed-off-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Reviewed-by: Thomas Zimmermann <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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