user32: Check for bad scroll value and fix return values in EDIT_EM_Scroll

[Alistair Leslie-Hughes]

Hi,

Based on a patch by David Hedberg and later Austin English.
Fixes bug 1517.
Corrected test and corrected tab/space issues.


Changelog:
	user32: Check for bad scroll value and fix return values in EDIT_EM_Scroll

Best Regards
  Alistair Leslie-Hughes





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