Refactored ngx_solaris_sendfilev_chain().

Though ngx_solaris_sendfilev_chain() shouldn't suffer from the problem mentioned
in d1bde5c3c5d2 since currently IOV_MAX on Solaris is 16, but this follows the
change from 3d5717550371 in order to make the code look similar to other systems
and potentially eliminates the problem in the future.

src/os/unix/ngx_solaris_sendfilev_chain.c

diff --git a/src/os/unix/ngx_solaris_sendfilev_chain.c b/src/os/unix/ngx_solaris_sendfilev_chain.c
index e618379..7504239 100644
--- a/src/os/unix/ngx_solaris_sendfilev_chain.c
+++ b/src/os/unix/ngx_solaris_sendfilev_chain.c
@@ -48,8 +48,8 @@
     ssize_t         n;
     ngx_int_t       eintr;
     ngx_err_t       err;
+    ngx_uint_t      nsfv;
     sendfilevec_t  *sfv, sfvs[NGX_SENDFILEVECS];
-    ngx_array_t     vec;
     ngx_event_t    *wev;
     ngx_chain_t    *cl;
 
@@ -73,11 +73,6 @@
 
     send = 0;
 
-    vec.elts = sfvs;
-    vec.size = sizeof(sendfilevec_t);
-    vec.nalloc = NGX_SENDFILEVECS;
-    vec.pool = c->pool;
-
     for ( ;; ) {
         fd = SFV_FD_SELF;
         prev = NULL;
@@ -87,7 +82,7 @@
         sent = 0;
         prev_send = send;
 
-        vec.nelts = 0;
+        nsfv = 0;
 
         /* create the sendfilevec and coalesce the neighbouring bufs */
 
@@ -110,14 +105,11 @@
                     sfv->sfv_len += (size_t) size;
 
                 } else {
-                    if (vec.nelts >= IOV_MAX) {
+                    if (nsfv == NGX_SENDFILEVECS) {
                         break;
                     }
 
-                    sfv = ngx_array_push(&vec);
-                    if (sfv == NULL) {
-                        return NGX_CHAIN_ERROR;
-                    }
+                    sfv = &sfvs[nsfv++];
 
                     sfv->sfv_fd = SFV_FD_SELF;
                     sfv->sfv_flag = 0;
@@ -148,14 +140,11 @@
                     sfv->sfv_len += (size_t) size;
 
                 } else {
-                    if (vec.nelts >= IOV_MAX) {
+                    if (nsfv == NGX_SENDFILEVECS) {
                         break;
                     }
 
-                    sfv = ngx_array_push(&vec);
-                    if (sfv == NULL) {
-                        return NGX_CHAIN_ERROR;
-                    }
+                    sfv = &sfvs[nsfv++];
 
                     fd = cl->buf->file->fd;
                     sfv->sfv_fd = fd;
@@ -169,7 +158,7 @@
             }
         }
 
-        n = sendfilev(c->fd, vec.elts, vec.nelts, &sent);
+        n = sendfilev(c->fd, sfvs, nsfv, &sent);
 
         if (n == -1) {
             err = ngx_errno;