eal/linux: remove unused variable for socket memory
eal/linux: remove unused variable for socket memory

clang-13 rightfully complains that the total_mem variable in
eal_parse_socket_arg is set but not used, since the final
accumulated total_mem result isn't used anywhere.
So just remove the total_mem variable.

Fixes: 0a703f0f36c1 ("eal/linux: fix parsing zero socket memory and limits")

Signed-off-by: Jim Harris <c97c4480f77eb02232ac9ce8a41dcd0fa27f58ba@intel.com>
Reviewed-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk