Fix unused variable warning

The temporary variable causes unused variable warnings in opt mode with clang,
because the subsequent assert is compiled out.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 6af16ec5eed85390bcbd004806a842d6153d6a31)

diff --git a/crypto/bn/bn.h b/crypto/bn/bn.h
index 21a1a3fe35c0842a9583e4770d62350af8d8c50c..c4d618522e265aaf3a40a18454ea0230b0397ff8 100644 (file)
--- a/crypto/bn/bn.h
+++ b/crypto/bn/bn.h
@@ -780,7 +780,9 @@ int RAND_pseudo_bytes(unsigned char *buf,int num);
 #define bn_wcheck_size(bn, words) \
        do { \
                const BIGNUM *_bnum2 = (bn); \
-               assert(words <= (_bnum2)->dmax && words >= (_bnum2)->top); \
+               assert((words) <= (_bnum2)->dmax && (words) >= (_bnum2)->top); \
+               /* avoid unused variable warning with NDEBUG */ \
+               (void)(_bnum2); \
        } while(0)
 
 #else /* !BN_DEBUG */