Correct the backward logic using !net_ratelimit()

Miscellanea:

o Add a blank line before the error return label
Signed-off-by: NJoe Perches <joe@perches.com>
Tested-by: NKrishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>