Don't check pointers against 0

[Marcus Glocker]

Reported by Peter J. Philipp.

OK?


Index: sys/netinet/udp_usrreq.c
===================================================================
RCS file: /cvs/src/sys/netinet/udp_usrreq.c,v
retrieving revision 1.260
diff -u -p -u -p -r1.260 udp_usrreq.c
--- sys/netinet/udp_usrreq.c    1 Aug 2020 23:41:56 -0000       1.260
+++ sys/netinet/udp_usrreq.c    5 Aug 2020 20:49:02 -0000
@@ -486,7 +486,7 @@ udp_input(struct mbuf **mp, int *offp, i
                inp = in_pcbhashlookup(&udbtable, ip->ip_src, uh->uh_sport,
                    ip->ip_dst, uh->uh_dport, m->m_pkthdr.ph_rtableid);
        }
-       if (inp == 0) {
+       if (inp == NULL) {
                udpstat_inc(udps_pcbhashmiss);
 #ifdef INET6
                if (ip6) {
@@ -519,7 +519,7 @@ udp_input(struct mbuf **mp, int *offp, i
        }
 #endif /*IPSEC */
 
-       if (inp == 0) {
+       if (inp == NULL) {
                udpstat_inc(udps_noport);
                if (m->m_flags & (M_BCAST | M_MCAST)) {
                        udpstat_inc(udps_noportbcast);