kni: fix Rx loop limit
kni: fix Rx loop limit

Loop processing packets dequeued from rx_q was using the number of
packets requested, not how many it actually received.

Variable rename to make code a little more clear

Signed-off-by: Jay Rolette <f7c58b0a9fb04dc409a0127d2c7f498e5b32ad8a@infiniteio.com>
Acked-by: Bruce Richardson <66b9e8e8fbd5e9f41f91b0af050876182ce9d0e4@intel.com>
Acked-by: Helin Zhang <aba9dfdb1a6ec8bf1ff66b95272c029f8dfde1b1@intel.com>

tsphillips/dpdk-fork,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,mixja/dpdk,venkynv/dpdk-mirror,venkynv/dpdk-mirror,msune/dpdk,venkynv/dpdk-mirror,mixja/dpdk,tsphillips/dpdk-fork,john-mcnamara-intel/dpdk,venkynv/dpdk-mirror,msune/dpdk,mixja/dpdk,mixja/dpdk,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,msune/dpdk,msune/dpdk