Fix connection leak.

This was introduced when attempting to reuse ssh connection.

zfs_replication_exporter.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
+	_ "net/http/pprof"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -28,8 +29,8 @@ var (
 
 const snapshotListCmd = "/sbin/zfs list -t snapshot -H -o name -s name"
 
-// Example: @auto-20171001.1400-2w
 var (
+	// Example: @auto-20171001.1400-2w
 	snapshotPattern = regexp.MustCompile(`^[^@]+@auto-(\d{8}\.\d{4})-\d+[mwy]$`)
 	snapshotFormat  = "20060102.1504"
 
@@ -186,8 +187,8 @@ func main() {
 				HostKeyCallback: ssh.InsecureIgnoreHostKey(),
 				Timeout:         5 * time.Second,
 			}
-			for {
 			var c *ssh.Client
+			for {
 				if c == nil {
 					var err error
 					c, err = ssh.Dial("tcp", host, config)