Use NULL instead of 0 for pointers.

Also malloc will return NULL if it cannot allocate memory.

MFC after:	2 weeks.

3 files changed, 7 insertions, 7 deletions

diff --git a/usr.bin/netstat/inet.c b/usr.bin/netstat/inet.c
index 4793229..54ab56f 100644
--- a/usr.bin/netstat/inet.c
+++ b/usr.bin/netstat/inet.c
@@ -120,7 +120,7 @@ pcblist_sysctl(int proto, const char *name, char **bufp, int istcp __unused)
 			xo_warn("sysctl: %s", mibvar);
 		return (0);
 	}
-	if ((buf = malloc(len)) == 0) {
+	if ((buf = malloc(len)) == NULL) {
 		xo_warnx("malloc %lu bytes", (u_long)len);
 		return (0);
 	}
@@ -207,7 +207,7 @@ pcblist_kvm(u_long off, char **bufp, int istcp)
 		len = 2 * sizeof(xig) +
 		    (pcbinfo.ipi_count + pcbinfo.ipi_count / 8) *
 		    sizeof(struct xinpcb);
-	if ((buf = malloc(len)) == 0) {
+	if ((buf = malloc(len)) == NULL) {
 		xo_warnx("malloc %lu bytes", (u_long)len);
 		return (0);
 	}
@@ -1460,7 +1460,7 @@ inetname(struct in_addr *inp)
 			if (np)
 				cp = np->n_name;
 		}
-		if (cp == 0) {
+		if (cp == NULL) {
 			hp = gethostbyaddr((char *)inp, sizeof (*inp), AF_INET);
 			if (hp) {
 				cp = hp->h_name;
diff --git a/usr.bin/netstat/sctp.c b/usr.bin/netstat/sctp.c
index 6c766b2..db40f9c 100644
--- a/usr.bin/netstat/sctp.c
+++ b/usr.bin/netstat/sctp.c
@@ -128,7 +128,7 @@ inetname(struct in_addr *inp)
 			if (np)
 				cp = np->n_name;
 		}
-		if (cp == 0) {
+		if (cp == NULL) {
 			hp = gethostbyaddr((char *)inp, sizeof (*inp), AF_INET);
 			if (hp) {
 				cp = hp->h_name;
@@ -586,7 +586,7 @@ sctp_protopr(u_long off __unused,
 			xo_warn("sysctl: %s", mibvar);
 		return;
 	}
-	if ((buf = malloc(len)) == 0) {
+	if ((buf = malloc(len)) == NULL) {
 		xo_warnx("malloc %lu bytes", (u_long)len);
 		return;
 	}
diff --git a/usr.bin/netstat/unix.c b/usr.bin/netstat/unix.c
index 04e4ae5..29668a4 100644
--- a/usr.bin/netstat/unix.c
+++ b/usr.bin/netstat/unix.c
@@ -83,7 +83,7 @@ pcblist_sysctl(int type, char **bufp)
 			xo_warn("sysctl: %s", mibvar);
 		return (-1);
 	}
-	if ((buf = malloc(len)) == 0) {
+	if ((buf = malloc(len)) == NULL) {
 		xo_warnx("malloc %lu bytes", (u_long)len);
 		return (-2);
 	}
@@ -116,7 +116,7 @@ pcblist_kvm(u_long count_off, u_long gencnt_off, u_long head_off, char **bufp)
 		return (-1);
 	kread(count_off, &unp_count, sizeof(unp_count));
 	len = 2 * sizeof(xug) + (unp_count + unp_count / 8) * sizeof(xu);
-	if ((buf = malloc(len)) == 0) {
+	if ((buf = malloc(len)) == NULL) {
 		xo_warnx("malloc %lu bytes", (u_long)len);
 		return (-2);
 	}