eal: fix memory leak when saving arguments

eal: fix memory leak when saving arguments

This patch fixes a memleak which was reported in Bugzilla within the
eal_save_args function. This was caused by the function mistakenly
adding -- to the eal args instead of breaking beforehand.

Bugzilla ID: 722
Fixes: 293c53d8b23c ("eal: add telemetry callbacks")

Reported-by: Zhihong Peng <zhihongx.peng@intel.com>
Signed-off-by: Conor Walsh <conor.walsh@intel.com>
Signed-off-by: Conor Fogarty <conor.fogarty@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>