user32: GetClipboardData() should set last error when the format is not found.

dlls/user32/tests/clipboard.c

@@ -986,7 +986,9 @@ static void test_synthesized(void)
 
     SetLastError(0xdeadbeef);
     data = GetClipboardData( CF_TEXT );
-    ok(GetLastError() == 0xdeadbeef, "bad last error %ld\n", GetLastError());
+    ok(GetLastError() == ERROR_NOT_FOUND /* win11 */ ||
+       broken(GetLastError() == 0xdeadbeef),
+       "bad last error %ld\n", GetLastError());
     ok(!data, "GetClipboardData() should have returned NULL\n");
 
     r = CloseClipboard();
@@ -1587,7 +1589,9 @@ static void test_handles( HWND hwnd )
 
     SetLastError( 0xdeadbeef );
     data = GetClipboardData( CF_RIFF );
-    ok( GetLastError() == 0xdeadbeef, "unexpected last error %ld\n", GetLastError() );
+    ok( GetLastError() == ERROR_NOT_FOUND /* win11 */ ||
+        broken(GetLastError() == 0xdeadbeef),
+        "unexpected last error %ld\n", GetLastError() );
     ok( !data, "wrong data %p\n", data );
 
     h = SetClipboardData( CF_PRIVATEFIRST + 7, htext4 );

dlls/win32u/clipboard.c

@@ -720,7 +720,11 @@ HANDLE WINAPI NtUserGetClipboardData( UINT format, struct get_clipboard_params *
             params->data_size = size;
             return 0;
         }
-        if (status == STATUS_OBJECT_NAME_NOT_FOUND) return 0; /* no such format */
+        if (status == STATUS_OBJECT_NAME_NOT_FOUND)
+        {
+            RtlSetLastWin32Error( ERROR_NOT_FOUND ); /* no such format */
+            return 0;
+        }
         if (status)
         {
             RtlSetLastWin32Error( RtlNtStatusToDosError( status ));