Simplified ngx_http_init_listening().

There is no need to set "i" to 0, as it's expected to be 0 assuming
the bindings are properly sorted, and we already rely on this when
explicitly set hport->naddrs to 1.  Remaining conditional code is
replaced with identical "hport->naddrs = i + 1".

Identical modifications are done in the mail and stream modules,
in the ngx_mail_optimize_servers() and ngx_stream_optimize_servers()
functions, respectively.

No functional changes.

src/http/ngx_http.c

diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 924c4b5..adb4b6f 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -1719,13 +1719,7 @@
 
         ls->servers = hport;
 
-        if (i == last - 1) {
-            hport->naddrs = last;
-
-        } else {
-            hport->naddrs = 1;
-            i = 0;
-        }
+        hport->naddrs = i + 1;
 
         switch (ls->sockaddr->sa_family) {
 

src/mail/ngx_mail.c

diff --git a/src/mail/ngx_mail.c b/src/mail/ngx_mail.c
index 48ce286..f10f08c 100644
--- a/src/mail/ngx_mail.c
+++ b/src/mail/ngx_mail.c
@@ -392,13 +392,7 @@
 
             ls->servers = mport;
 
-            if (i == last - 1) {
-                mport->naddrs = last;
-
-            } else {
-                mport->naddrs = 1;
-                i = 0;
-            }
+            mport->naddrs = i + 1;
 
             switch (ls->sockaddr->sa_family) {
 #if (NGX_HAVE_INET6)

src/stream/ngx_stream.c

diff --git a/src/stream/ngx_stream.c b/src/stream/ngx_stream.c
index e5ffcf9..18aea28 100644
--- a/src/stream/ngx_stream.c
+++ b/src/stream/ngx_stream.c
@@ -393,13 +393,7 @@
 
             ls->servers = stport;
 
-            if (i == last - 1) {
-                stport->naddrs = last;
-
-            } else {
-                stport->naddrs = 1;
-                i = 0;
-            }
+            stport->naddrs = i + 1;
 
             switch (ls->sockaddr->sa_family) {
 #if (NGX_HAVE_INET6)