Fix mismatch between header and implementation of bn_sqr_comba8.

Bug: 402
Change-Id: I6de879f44f6e3eca26f2f49c500769d944fa9bc0
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/46404
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/fipsmodule/bn/internal.h b/crypto/fipsmodule/bn/internal.h
index 623e0c6..3d368db 100644
--- a/crypto/fipsmodule/bn/internal.h
+++ b/crypto/fipsmodule/bn/internal.h
@@ -297,7 +297,7 @@
 void bn_mul_comba8(BN_ULONG r[16], const BN_ULONG a[8], const BN_ULONG b[8]);
 
 // bn_sqr_comba8 sets |r| to |a|^2.
-void bn_sqr_comba8(BN_ULONG r[16], const BN_ULONG a[4]);
+void bn_sqr_comba8(BN_ULONG r[16], const BN_ULONG a[8]);
 
 // bn_sqr_comba4 sets |r| to |a|^2.
 void bn_sqr_comba4(BN_ULONG r[8], const BN_ULONG a[4]);