crypto/mem.c: tfix in CRYPTO_aligned_alloc

crypto/mem.c: tfix in CRYPTO_aligned_alloc

* crypto/mem.c [OPENSSL_SMALL_FOOTPRINT] (CRYPTO_aligned_alloc): Change
freeptr to *freeptr to properly update the variable passed by pointer.

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28059)