pfctl: simplify getaddrinfo() error handling in host_dns()

[Klemens Nanni]

We're not using `error' anyway so drop the variable and jump to the end.

OK?

Index: pfctl_parser.c
===================================================================
RCS file: /cvs/src/sbin/pfctl/pfctl_parser.c,v
retrieving revision 1.321
diff -u -p -r1.321 pfctl_parser.c
--- pfctl_parser.c      10 Jul 2018 09:30:49 -0000      1.321
+++ pfctl_parser.c      22 Jul 2018 10:47:47 -0000
@@ -1806,8 +1806,7 @@ host_dns(const char *s, int v4mask, int 
 {
        struct addrinfo          hints, *res0, *res;
        struct node_host        *n, *h = NULL;
-       int                      error, noalias = 0;
-       int                      got4 = 0, got6 = 0;
+       int                      noalias = 0, got4 = 0, got6 = 0;
        char                    *p, *ps;
 
        if ((ps = strdup(s)) == NULL)
@@ -1821,11 +1820,8 @@ host_dns(const char *s, int v4mask, int 
        hints.ai_socktype = SOCK_STREAM; /* DUMMY */
        if (numeric)
                hints.ai_flags = AI_NUMERICHOST;
-       error = getaddrinfo(ps, NULL, &hints, &res0);
-       if (error) {
-               free(ps);
-               return (h);
-       }
+       if (getaddrinfo(ps, NULL, &hints, &res0) != 0)
+               goto error;
 
        for (res = res0; res; res = res->ai_next) {
                if (res->ai_family != AF_INET &&
@@ -1873,6 +1869,7 @@ host_dns(const char *s, int v4mask, int 
                }
        }
        freeaddrinfo(res0);
+error:
        free(ps);
 
        return (h);