[Pcsclite-muscle] check for errors the udev functions in pcscd

[Nikos Mavrogiannopoulos]

[resent to the new list]

Hello,
 The attached patch checks the udev functions for errors and can prevent
the crash reported at:
https://bugzilla.redhat.com/show_bug.cgi?id=1071243

What I haven't figured out is the reason of the udev function failure
though.

regards,
Nikos


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