net/ipn3ke: fix thread exit

[ upstream commit d8f8e928a7ba23283300b1b80259d0c102348005 ]

Thread does not exit after driver is removed. When there is no
more representor exist, the variable 'num' will be 0 and thread
can exit safely at this time.

Fixes: 70d6b7f ("net/ipn3ke: add representor")

Signed-off-by: Wei Huang <wei.huang@intel.com>
Acked-by: Rosen Xu <rosen.xu@intel.com>

drivers/net/ipn3ke/ipn3ke_representor.c

@@ -2579,7 +2579,7 @@ ipn3ke_rpst_scan_handle_request(__rte_unused void *param)
 		}
 		rte_delay_us(50 * MS);
 
-		if (num == 0xffffff)
+		if (num == 0 || num == 0xffffff)
 			return NULL;
 	}