net_wire,lib/nicbm: fix argument parsing

lib/simbricks/nicbm/nicbm.cc

@@ -400,7 +400,7 @@ int Runner::RunMain(int argc, char *argv[]) {
   uint64_t eth_latency = 500 * 1000ULL;
   int sync_mode = SIMBRICKS_PROTO_SYNC_SIMBRICKS;
 
-  if (argc < 4 && argc > 9) {
+  if (argc < 4 || argc > 9) {
     fprintf(stderr,
             "Usage: corundum_bm PCI-SOCKET ETH-SOCKET "
             "SHM [SYNC-MODE] [START-TICK] [SYNC-PERIOD] [PCI-LATENCY] "

sims/net/wire/net_wire.c

@@ -109,7 +109,7 @@ int main(int argc, char *argv[]) {
   pcap_t *pc = NULL;
   int sync_mode = SIMBRICKS_PROTO_SYNC_SIMBRICKS;
 
-  if (argc < 3 && argc > 7) {
+  if (argc < 3 || argc > 7) {
     fprintf(stderr,
             "Usage: net_wire SOCKET-A SOCKET-B [SYNC-MODE] "
             "[SYNC-PERIOD] [ETH-LATENCY] [PCAP-FILE]\n");