powerpc/powernv: Change BUG_ON to WARN_ON in elog code
powerpc/powernv: Change BUG_ON to WARN_ON in elog code

We can continue to read the error log (up to MAX size) even if
we get the elog size more than MAX size. Hence change BUG_ON to
WARN_ON.

Also updated error message.

Reported-by: Gopesh Kumar Chaudhary <a2338237cf67e5596d184e35d35aede4898bf5f5@in.ibm.com>
Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>
Signed-off-by: Ananth N Mavinakayanahalli <7dc108d19a2513f6455353af182b9e4d3b794ec9@in.ibm.com>
Acked-by: Deepthi Dharwar <3f83f38ad2e2ddcc47e21eb12a05ce66eb4cf525@linux.vnet.ibm.com>
Acked-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>

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