quartz: Don't call ReleaseSemaphore on NULL semaphore handles.
tree9b5d96fce2c8785a8635d722b762b2d7febeed58
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drwxr-xr-x - dlls
drwxr-xr-x - documentation
drwxr-xr-x - fonts
drwxr-xr-x - include
drwxr-xr-x - libs
drwxr-xr-x - loader
drwxr-xr-x - programs
drwxr-xr-x - server
drwxr-xr-x - tools