fixing x64 build with vs2015
diff --git a/src/core/security/credentials.c b/src/core/security/credentials.c
index a005474..3013fac 100644
--- a/src/core/security/credentials.c
+++ b/src/core/security/credentials.c
@@ -179,8 +179,8 @@
GRPC_API_TRACE(
"grpc_server_credentials_set_auth_metadata_processor("
"creds=%p, "
- "processor=grpc_auth_metadata_processor { process: %lx, state: %p })",
- 3, (creds, (unsigned long)processor.process, processor.state));
+ "processor=grpc_auth_metadata_processor { process: %p, state: %p })",
+ 3, (creds, (void*)(gpr_intptr)processor.process, processor.state));
if (creds == NULL) return;
if (creds->processor.destroy != NULL && creds->processor.state != NULL) {
creds->processor.destroy(creds->processor.state);