Bug 798356 - Do not convert a boolean literal into a null pointer constant in TransportDIB::Map; r=cjones

--HG--
extra : rebase_source : 1d7a6be5ee0b090b9a4cf73158b1588eaef55390

ipc/chromium/src/chrome/common/transport_dib_mac.cc

@@ -44,7 +44,7 @@ TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) {
   if (!dib->shared_memory_.Map(st.st_size)) {
     delete dib;
     HANDLE_EINTR(close(handle.fd));
-    return false;
+    return nullptr;
   }
 
   dib->size_ = st.st_size;