move cdef

Author: rockspore

src/python/grpcio/grpc/_cython/_cygrpc/credentials.pyx.pxi

@@ -196,22 +196,24 @@ cdef class SSLChannelCredentials(ChannelCredentials):
     self._certificate_chain = certificate_chain
 
   cdef grpc_channel_credentials *c(self) except *:
-    cdef const char *c_pem_root_certificates = NULL
+    cdef const char *c_pem_root_certificates
+    cdef const char *c_private_key
+    cdef const char *c_cert_chain
     cdef grpc_tls_credenentials_options* c_tls_credentials_options
     cdef grpc_tls_identity_pairs* c_tls_identity_pairs = NULL
+    cdef grpc_tls_certificate_provider* c_tls_certificate_provider
 
     c_tls_credentials_options = grpc_tls_credenentials_options_create()
-    if self._pem_root_certificates:
+    if self._pem_root_certificates is not None:
       c_pem_root_certificates = self._pem_root_certificates
+    else:
+      c_pem_root_certificates = NULL
     if self._private_key or self._certificate_chain:
       c_tls_identity_pairs = grpc_tls_identity_pairs_create()
-      cdef const char *c_private_key
       c_private_key = self._private_key if self._private_key else NULL
-      cdef const char *c_cert_chain
       c_cert_chain = self._certificate_chain if self._certificate_chain else NULL
       grpc_tls_identity_pairs_add_pair(c_tls_identity_pairs, c_private_key, c_cert_chain)
     if c_pem_root_certificates != NULL or c_tls_identity_pairs != NULL:
-      cdef grpc_tls_certificate_provider* c_tls_certificate_provider
       c_tls_certificate_provider = grpc_tls_certificate_provider_static_data_create(c_pem_root_certificates, c_tls_identity_pairs)
       grpc_tls_credentials_options_set_certificate_provider(c_tls_credentials_options, c_tls_certificate_provider)
     with nogil: