Check for NULL handle validation in set_focus_window function

[Santosh Siddheshwar]

Hi,
	In function set_focus_window() ( File: /dlls/user/focus.c ) window
handle received through parameter is not checking for NULL handle, this is
causing crash in wine in some circumstances. Modified the function
set_focus_wine() to handle the NULL handles.

Change Log: Change for NULL handle validation in function
set_focus_window().
Name: Santosh Siddheshwar
Mail Id: santosh.s at sonata-software.com
Regards
Santosh
 <<patch.diff>> 

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