[Bug 44839] New: dlls/user32/mdi.c , get_client_info returns NULL when fails

https://bugs.winehq.org/show_bug.cgi?id=44839

Bug ID: 44839
           Summary: dlls/user32/mdi.c , get_client_info returns  NULL when
                    fails
           Product: Wine
           Version: 3.4
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

dlls/user32/mdi.c ,  the function "get_client_info"return  NULL when fails ,
there is 10 locations calling it, but check for the return value most locations
exception the line 285, 603,1906;
I think there should be added check just like the other places.