winex11.drv: Prevent XCreateIC from returning NULL when input style isn't "root".

[Muneyuki Noguchi]

winex11.drv: Prevent XCreateIC from returning NULL when input style
isn't "root".

Currently Wine users can't turn on SCIM, an input method, when input
style isn't "root" e.g. "over the spot". The patch fix this
regression.

-- 
Muneyuki Noguchi
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