compobj.dll16: void functions should not return a value

[Andrew Talbot]

Changelog:
    compobj.dll16: void functions should not return a value.

diff --git a/dlls/compobj.dll16/compobj.c b/dlls/compobj.dll16/compobj.c
index f4b5d5d..ed36564 100644
--- a/dlls/compobj.dll16/compobj.c
+++ b/dlls/compobj.dll16/compobj.c
@@ -306,7 +306,7 @@ void WINAPI CoUninitialize16(void)
  */
 void WINAPI CoFreeUnusedLibraries16(void)
 {
-    return CoFreeUnusedLibraries();
+    CoFreeUnusedLibraries();
 }
 
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