Merge pull request #427 from dwrensha/remove-pointless-memset

omit needless memset

c++/src/capnp/layout.c++

@@ -1611,11 +1611,6 @@ struct WireHelpers {
       }
     } else {
       memcpy(ptr, value.data, dataSize / BYTES);
-      if (dataSize % BYTES_PER_WORD != 0 * BYTES) {
-        //Zero-pad the data if it didn't use the entire last word
-        byte* padStart = reinterpret_cast<byte*>(ptr) + (dataSize / BYTES);
-        memset(padStart, 0, (BYTES_PER_WORD * WORDS - (dataSize % BYTES_PER_WORD)) / BYTES);
-      }
     }
 
     WirePointer* pointerSection = reinterpret_cast<WirePointer*>(ptr + dataWords);