parisc: Remove spurious if statement from raw_copy_from_user()

Accidently introduced in commit 91428ca9.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Fixes: 91428ca9 ("parisc: Check region is readable by user in raw_copy_from_user()")
Cc: stable@vger.kernel.org # v5.12+