remove extra space in Csharp code
diff --git a/src/csharp/ext/grpc_csharp_ext.c b/src/csharp/ext/grpc_csharp_ext.c
index e1f4d7c..6a24119 100644
--- a/src/csharp/ext/grpc_csharp_ext.c
+++ b/src/csharp/ext/grpc_csharp_ext.c
@@ -761,7 +761,7 @@
     ops[nops].data.send_message.send_message = ctx->send_message;
     ops[nops].flags = write_flags;
     ops[nops].reserved = NULL;
-    nops ++;
+    nops++;
   }
   if (send_empty_initial_metadata) {
     ops[nops].op = GRPC_OP_SEND_INITIAL_METADATA;