MSACM: fix incorrect linked list traversing leading to memory/driver instance leak

[Alex Villací­s Lasso]

While preparing local codec support for msacm this weekend, I wondered 
why my local driver references (which were cleaned up as part of 
acmDriverClose()) were being leaked. Then I discovered this... odd... 
pointer manipulation for linked-list traversal. After fixing it, the 
leaks went away. Please note that this strange pointer manipulation is 
part of Wine CVS, not introduced by my local work, so driver instances 
are being leaked unless the patch is applied.

Changelog:
* Fix incorrect linked list traversing leading to memory/driver instance 
leak

Alex Villacís Lasso

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