Merge pull request #16650 from muxi/fix-analyze-issue

Fix analyze issues in gRPC ObjC lib

src/objective-c/GRPCClient/private/GRPCHost.m

@@ -69,7 +69,7 @@ static NSMutableDictionary *kHostCache;
   // gRPC library.
   // TODO(jcanizales): Add unit tests for the types of addresses we want to let pass untouched.
   NSURL *hostURL = [NSURL URLWithString:[@"https://" stringByAppendingString:address]];
-  if (hostURL.host && !hostURL.port) {
+  if (hostURL.host && hostURL.port == nil) {
     address = [hostURL.host stringByAppendingString:@":443"];
   }
 
@@ -193,6 +193,7 @@ static NSMutableDictionary *kHostCache;
   if (pemPrivateKey == nil && pemCertChain == nil) {
     creds = grpc_ssl_credentials_create(rootsASCII.bytes, NULL, NULL, NULL);
   } else {
+    assert(pemPrivateKey != nil && pemCertChain != nil);
     grpc_ssl_pem_key_cert_pair key_cert_pair;
     NSData *privateKeyASCII = [self nullTerminatedDataWithString:pemPrivateKey];
     NSData *certChainASCII = [self nullTerminatedDataWithString:pemCertChain];
@@ -226,7 +227,7 @@ static NSMutableDictionary *kHostCache;
     args[@GRPC_SSL_TARGET_NAME_OVERRIDE_ARG] = _hostNameOverride;
   }
 
-  if (_responseSizeLimitOverride) {
+  if (_responseSizeLimitOverride != nil) {
     args[@GRPC_ARG_MAX_RECEIVE_MESSAGE_LENGTH] = _responseSizeLimitOverride;
   }