opal-elog-parse: don't double print usage when no args supplied
opal-elog-parse: don't double print usage when no args supplied

Duplication of code has caused usage to be printed twice if opal-elog-parse
is not given any command line args.

Signed-off-by: Cyril Bur <367d233c448abb973a0136207eb0cf446765a6f5@ozlabs.au.ibm.com>
Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>

leitao/ppc64-diag,leitao/ppc64-diag,leitao/ppc64-diag,leitao/ppc64-diag