Fix some trivial sign-compare compiler warnings

Change-Id: I1918c43202b87f0c987bfd9155c739da7dd02632
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20250114165206.13187-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg30455.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>

Author: flichtenheld

src/openvpn/options.c

@@ -1448,7 +1448,7 @@ foreign_options_copy_dns(struct options *o, struct env_set *es)
 
     while (server)
     {
-        for (int i = 0; i < server->addr_count; ++i)
+        for (size_t i = 0; i < server->addr_count; ++i)
         {
             if (server->addr[i].family == AF_INET)
             {

src/openvpn/socket.c

@@ -3132,8 +3132,7 @@ static const struct proto_names proto_names[] = {
 int
 ascii2proto(const char *proto_name)
 {
-    int i;
-    for (i = 0; i < SIZE(proto_names); ++i)
+    for (size_t i = 0; i < SIZE(proto_names); ++i)
     {
         if (!strcmp(proto_name, proto_names[i].short_form))
         {
@@ -3146,8 +3145,7 @@ ascii2proto(const char *proto_name)
 sa_family_t
 ascii2af(const char *proto_name)
 {
-    int i;
-    for (i = 0; i < SIZE(proto_names); ++i)
+    for (size_t i = 0; i < SIZE(proto_names); ++i)
     {
         if (!strcmp(proto_name, proto_names[i].short_form))
         {
@@ -3160,8 +3158,7 @@ ascii2af(const char *proto_name)
 const char *
 proto2ascii(int proto, sa_family_t af, bool display_form)
 {
-    unsigned int i;
-    for (i = 0; i < SIZE(proto_names); ++i)
+    for (size_t i = 0; i < SIZE(proto_names); ++i)
     {
         if (proto_names[i].proto_af == af && proto_names[i].proto == proto)
         {
@@ -3183,9 +3180,8 @@ const char *
 proto2ascii_all(struct gc_arena *gc)
 {
     struct buffer out = alloc_buf_gc(256, gc);
-    int i;
 
-    for (i = 0; i < SIZE(proto_names); ++i)
+    for (size_t i = 0; i < SIZE(proto_names); ++i)
     {
         if (i)
         {

src/openvpn/tun.c

@@ -669,7 +669,7 @@ warn_on_use_of_common_subnets(openvpn_net_ctx_t *ctx)
 {
     struct gc_arena gc = gc_new();
     struct route_gateway_info rgi;
-    const int needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED);
+    const unsigned int needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED);
 
     get_default_gateway(&rgi, ctx);
     if ((rgi.flags & needed) == needed)