s390/pci: fix possible information leak in mmio syscall
s390/pci: fix possible information leak in mmio syscall

Make sure that even in error situations we do not use copy_to_user
on uninitialized kernel memory.

Cc: 4fbacc2fa0ffdbb11bf1ad6925b886ebd08dd15f@vger.kernel.org # 3.19+
Signed-off-by: Sebastian Ott <34be3ca399e9e73d80098c083a5b58614c3ca6da@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <52616596d8f5df0d597e85ab515377f92f939c68@de.ibm.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs