Fix VC warnings about unary minus to an unsigned type.

Reviewed-by: Andy Polyakov <appro@openssl.org>
GH: #2230
(partial cherry pick from commit 68d4bcfd0651c7ea5d37ca52abc0d2e6e6b3bd20)

diff --git a/crypto/asn1/x_long.c b/crypto/asn1/x_long.c
index efdf574e24752c580d5d544ce2881217adf01bbe..2fd3a903d180bb093528e19949eb71735e9b48d3 100644 (file)
--- a/crypto/asn1/x_long.c
+++ b/crypto/asn1/x_long.c
@@ -126,7 +126,7 @@ static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
      * set.
      */
     if (ltmp < 0)
-        utmp = -(unsigned long)ltmp - 1;
+        utmp = 0 - (unsigned long)ltmp - 1;
     else
         utmp = ltmp;
     clen = BN_num_bits_word(utmp);