fix regression in inet_aton due to misinterpretation of __ipparse return

inet_aton returns a boolean success value, whereas __ipparse returns 0
on success and -1 on failure. also change the conditional in inet_addr
to be consistent with other uses of __ipparse where only negative
values are treated as failure.

src/network/inet_addr.c

@@ -6,6 +6,6 @@
 in_addr_t inet_addr(const char *p)
 {
 	struct sockaddr_in sin;
-	if (__ipparse(&sin, AF_INET, p)) return -1;
+	if (__ipparse(&sin, AF_INET, p) < 0) return -1;
 	return sin.sin_addr.s_addr;
 }

src/network/inet_legacy.c

@@ -11,9 +11,9 @@ in_addr_t inet_network(const char *p)
 int inet_aton(const char *cp, struct in_addr *inp)
 {
 	struct sockaddr_in sin;
-	int r = __ipparse(&sin, AF_INET, cp);
+	if (__ipparse(&sin, AF_INET, cp) < 0) return 0;
 	*inp = sin.sin_addr;
-	return r;
+	return 1;
 }
 
 struct in_addr inet_makeaddr(int net, int host)