PVS-Studio warning V559 for Miranda IM

void InternalPaintClc(HWND hwnd,struct ClcData *dat,
                      HDC hdc,RECT *rcPaint)
{
  ...
  if (Drawing->type=CLCIT_CONTACT)
  ...
}

This suspicious code was found in Miranda IM project by PVS-Studio static code analyzer.
Warning message is:
V559 Suspicious assignment inside the condition expression of 'if' operator: Drawing->type = 1. clist_mw clcpaint.c 548

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/