fix p256_64_msvc.h

Fixed: 427018041
Change-Id: Iae712b9e9cacd9c3e29b3c4e93077592d315ed05
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/79868
Reviewed-by: David Benjamin <davidben@google.com>
Auto-Submit: Andres Erbsen <andreser@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

third_party/fiat/p256_64_msvc.h

diff --git a/third_party/fiat/p256_64_msvc.h b/third_party/fiat/p256_64_msvc.h
index 3e8a129..0e56867 100644
--- a/third_party/fiat/p256_64_msvc.h
+++ b/third_party/fiat/p256_64_msvc.h
@@ -827,7 +827,7 @@
  */
 static FIAT_P256_FIAT_INLINE void fiat_p256_sub(fiat_p256_montgomery_domain_field_element out1, const fiat_p256_montgomery_domain_field_element arg1, const fiat_p256_montgomery_domain_field_element arg2) {
   // NOTE: edited by hand, see third_party/fiat/README.md
-  p256_coord_sub((br_word_t)&out1, (br_word_t)&arg1, (br_word_t)&arg2);
+  p256_coord_sub((br_word_t)out1, (br_word_t)arg1, (br_word_t)arg2);
 }
 
 /*