winmm/tests: remove dead assignment (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/winmm/tests/wave.c b/dlls/winmm/tests/wave.c
index 77a4cc1..c85f13c 100644
--- a/dlls/winmm/tests/wave.c
+++ b/dlls/winmm/tests/wave.c
@@ -319,7 +319,6 @@ const char * wave_open_flags(DWORD flags)
     if ((flags & WAVE_MAPPED) == WAVE_MAPPED) {
         if (!first) strcat(msg, "|");
         strcat(msg, "WAVE_MAPPED");
-        first = FALSE;
     }
     return msg;
 }