[PATCH] Fix a crash in KSharedConfigPtr

[Alex Merry]

I'm getting a crash in plasma caused by setting a KSharedConfigPtr to 0.  
It causes KSharedConfigPtr::attach(0) to be called, and then tries to 
dereference p (which is 0).

This patch should fix it, but I'm not certain it's correct.  Can someone 
tell me whether it makes sense?

Thanks

Alex



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