[PATCH] Hang in KTar

[Richard Smith]

Hi,

There's several nasty hangs in KTar, caused by code not checking 
QFile::open()'s return value. To reproduce:

(new KTar("something.tar.gz/anything"))->open(IO_ReadOnly);

KTar fails to open something.tar.gz/anything then falls into an infinite loop. 
The attached patch fixes that. OK to commit to HEAD? To BRANCH?

Thanks,
Richard
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