Update dependencies

vendor/github.com/prometheus/procfs/netstat.go

@@ -15,6 +15,7 @@ package procfs
 
 import (
 	"bufio"
+	"io"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -37,7 +38,12 @@ func (fs FS) NetStat() ([]NetStat, error) {
 	var netStatsTotal []NetStat
 
 	for _, filePath := range statFiles {
-		procNetstat, err := parseNetstat(filePath)
+		file, err := os.Open(filePath)
+		if err != nil {
+			return nil, err
+		}
+
+		procNetstat, err := parseNetstat(file)
 		if err != nil {
 			return nil, err
 		}
@@ -50,17 +56,14 @@ func (fs FS) NetStat() ([]NetStat, error) {
 
 // parseNetstat parses the metrics from `/proc/net/stat/` file
 // and returns a NetStat structure.
-func parseNetstat(filePath string) (NetStat, error) {
-	netStat := NetStat{
-		Stats: make(map[string][]uint64),
-	}
-	file, err := os.Open(filePath)
-	if err != nil {
-		return netStat, err
-	}
-	defer file.Close()
+func parseNetstat(r io.Reader) (NetStat, error) {
+	var (
+		scanner = bufio.NewScanner(r)
+		netStat = NetStat{
+			Stats: make(map[string][]uint64),
+		}
+	)
 
-	scanner := bufio.NewScanner(file)
 	scanner.Scan()
 
 	// First string is always a header for stats