message: Add some missing error messages during init contents prepare
diff: @@ -221,7 +221,10 @@ bool WrappedVulkan::Prepare_InitialState(WrappedVkRes *res)
  AllocateMemoryForResource(dstBuf, MemoryScope::InitialContents, MemoryType::Readback);
  if(readbackmem.mem == VK_NULL_HANDLE)
  + {
  + RDCERR("Couldn't allocate readback memory");
  return false;
  + }
  vkr = ObjDisp(d)->BindBufferMemory(Unwrap(d), Unwrap(dstBuf), Unwrap(readbackmem.mem),
  readbackmem.offs);
  @@ -451,7 +454,10 @@ bool WrappedVulkan::Prepare_InitialState(WrappedVkRes *res)
  AllocateMemoryForResource(dstBuf, MemoryScope::InitialContents, MemoryType::Readback);
  if(readbackmem.mem == VK_NULL_HANDLE)
  + {
  + RDCERR("Couldn't allocate readback memory");
  return false;
  + }
  CheckVkResult(vkr);
  vkr = ObjDisp(d)->BindBufferMemory(Unwrap(d), Unwrap(dstBuf), Unwrap(readbackmem.mem),
  