"sizeof" of the DEVMODE struct, instead of checking the struct size with dmSize
and the size of the private (device-specific) data with dmDriverExtra. Now it
creates the correct size of memory and copies all the non-private data and private data.
Bug 156318 r=dcone sr=kin,waterson,rpotts a=asa adt=putterman
git-svn-id: svn://10.0.0.236/branches/MOZILLA_1_0_BRANCH@125383 18797224-902f-48f8-a5cc-f745e15eee43