Bugfix-patches for dlls/comdlg32/filedlg.c

[Elias]

- Fix for bugzilla bug 16332
crash in file dialog if the previous selected folder is deleted

No checking was done on the selected initial directory for the
open-file dialog, which resulted in a stack overflow if the directory
was not present.

- Prevent free on NULL values
A typo made the CommDlg32 leak memory and potenially free NULL values.
Checks added/changed in two places.

-- 
Fortune-of-the-Mail:
Lady, lady, should you meet
One whose ways are all discreet,
One who murmurs that his wife
Is the lodestar of his life,
One who keeps assuring you
That he never was untrue,
Never loved another one...
Lady, lady, better run!
		-- Dorothy Parker, "Social Note"
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