EDAC: i7core: Return proper error codes for kzalloc() errors

... instead of possibly uninitialized return value.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: http://lkml.kernel.org/r/1423046938-18111-5-git-send-email-tiwai@suse.de


[ Add a commit message, albeit a small one. ]
Signed-off-by: Borislav Petkov <bp@suse.de>