address review feedback

src/csharp/Grpc.Core/Internal/SliceBufferSafeHandle.cs

@@ -138,7 +138,7 @@ namespace Grpc.Core.Internal
                 // if no hint is provided, keep the available space within some "reasonable" boundaries.
                 // This is quite a naive approach which could use some fine-tuning, but currently in most case we know
                 // the required buffer size in advance anyway, so this approach seems good enough for now.
-                if (tailSpaceLen < DefaultTailSpaceSize /2 )
+                if (tailSpaceLen < DefaultTailSpaceSize / 2)
                 {
                     AdjustTailSpace(DefaultTailSpaceSize);
                 }

src/csharp/ext/grpc_csharp_ext.c

@@ -44,8 +44,7 @@
 static grpc_byte_buffer* grpcsharp_create_byte_buffer_from_stolen_slices(
     grpc_slice_buffer* slice_buffer) {
   grpc_byte_buffer* bb =
-      (grpc_byte_buffer*)gpr_malloc(sizeof(grpc_byte_buffer));
+      (grpc_byte_buffer*)gpr_zalloc(sizeof(grpc_byte_buffer));
-  memset(bb, 0, sizeof(grpc_byte_buffer));
   bb->type = GRPC_BB_RAW;
   bb->data.raw.compression = GRPC_COMPRESS_NONE;
   grpc_slice_buffer_init(&bb->data.raw.slice_buffer);