kexec/powerpc: Handle buffer overflow in kernel command line

Enforce size check for kernel command line to make sure it
doesn't overflow COMMAND_LINE_SIZE.

Reported-by: Nathan D. Miller <nathanm2@us.ibm.com>
Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
2 files changed