[trivial] (type *)0 -> NULL

[Michael McConville]

While I'm in here:


Index: sys/lib/libsa/net.c
===================================================================
RCS file: /cvs/src/sys/lib/libsa/net.c,v
retrieving revision 1.19
diff -u -p -r1.19 net.c
--- sys/lib/libsa/net.c 26 Oct 2015 02:33:07 -0000      1.19
+++ sys/lib/libsa/net.c 26 Oct 2015 14:17:59 -0000
@@ -244,7 +244,7 @@ ip_convertaddr(const char *p)
 #define IP_ANYADDR     0
        u_int32_t addr = 0, n;
 
-       if (p == (char *)0 || *p == '\0')
+       if (p == NULL || *p == '\0')
                return IP_ANYADDR;
        p = number(p, &n);
        addr |= (n << 24) & 0xff000000;