more winmm dev cap cleanups

[Robert Reif]

Clean up *GetDevCaps to check for valid pointer and
only copy proper amount of data.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: winmm.diff
Type: application/x-unknown-content-type-diff_auto_file
Size: 15250 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-patches/attachments/20031029/fe561a12/winmm.bin