powerpc/vio: use strcpy in modalias_show
powerpc/vio: use strcpy in modalias_show

Commit e82b89a6f19bae73fb064d1b3dd91fcefbb478f4 used strcat instead of
strcpy which can result in an overflow of newlines on the buffer.

Signed-off-by: Prarit Bhargava
Cc: a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org
Cc: 73675debcd8a436be48ec22211dcf44fe0df0a64@decadent.org.uk
Cc: 4fbacc2fa0ffdbb11bf1ad6925b886ebd08dd15f@vger.kernel.org
Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>

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