user32/tests: remove unneeded assignment (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/user32/tests/cursoricon.c b/dlls/user32/tests/cursoricon.c
index 8f7db52..cba5704 100644
--- a/dlls/user32/tests/cursoricon.c
+++ b/dlls/user32/tests/cursoricon.c
@@ -1836,7 +1836,6 @@ static void test_DestroyCursor(void)
         ok( ret, "DestroyCursor succeeded\n" );
     else
         ok( !ret, "DestroyCursor succeeded\n" );
-    error = GetLastError();
     ok( GetLastError() == ERROR_INVALID_CURSOR_HANDLE || GetLastError() == 0xdeadbeef,
         "wrong error %u\n", GetLastError() );