Fix a C++ warning

diff --git a/lib/crypto/sha256.c b/lib/crypto/sha256.c
index a2def25814824f4dc65ff03bd142e4114d981606..233abe23f8dc6c7aa0085a7e30ca977b0f1ac48b 100644 (file)
--- a/lib/crypto/sha256.c
+++ b/lib/crypto/sha256.c
@@ -189,7 +189,7 @@ struct x32{
 void
 SHA256_Update (SHA256_CTX *m, const void *v, size_t len)
 {
-    const unsigned char *p = v;
+    const unsigned char *p = (const unsigned char *)v;
     size_t old_sz = m->sz[0];
     size_t offset;