Update github.com/prometheus/procfs dependency (#572)

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

@@ -523,15 +523,19 @@ func parseNFSTransportStats(ss []string, statVersion string) (*NFSTransportStats
 	}
 
 	// Allocate enough for v1.1 stats since zero value for v1.1 stats will be okay
-	// in a v1.0 response
-	ns := make([]uint64, 0, fieldTransport11Len)
-	for _, s := range ss {
+	// in a v1.0 response.
+	//
+	// Note: slice length must be set to length of v1.1 stats to avoid a panic when
+	// only v1.0 stats are present.
+	// See: https://github.com/prometheus/node_exporter/issues/571.
+	ns := make([]uint64, fieldTransport11Len)
+	for i, s := range ss {
 		n, err := strconv.ParseUint(s, 10, 64)
 		if err != nil {
 			return nil, err
 		}
 
-		ns = append(ns, n)
+		ns[i] = n
 	}
 
 	return &NFSTransportStats{

vendor/vendor.json

@@ -129,22 +129,22 @@
 			"revisionTime": "2017-02-20T10:38:46Z"
 		},
 		{
-			"checksumSHA1": "cD4xn1qxbkiuXqUExpdnDroCTrY=",
+			"checksumSHA1": "dA8hiwcAbubYRxTnpocR5VZkqAY=",
 			"path": "github.com/prometheus/procfs",
-			"revision": "332f6238064950a97bc3ed3f5421f6418537e707",
-			"revisionTime": "2017-04-21T21:58:51Z"
+			"revision": "6ac8c5d890d415025dd5aae7595bcb2a6e7e2fad",
+			"revisionTime": "2017-04-24T20:45:52Z"
 		},
 		{
 			"checksumSHA1": "eiBAd4edewJTOtTwxh/ubJdjd+I=",
 			"path": "github.com/prometheus/procfs/sysfs",
-			"revision": "332f6238064950a97bc3ed3f5421f6418537e707",
-			"revisionTime": "2017-04-21T21:58:51Z"
+			"revision": "6ac8c5d890d415025dd5aae7595bcb2a6e7e2fad",
+			"revisionTime": "2017-04-24T20:45:52Z"
 		},
 		{
 			"checksumSHA1": "xCiFAAwVTrjsfZT1BIJQ3DgeNCY=",
 			"path": "github.com/prometheus/procfs/xfs",
-			"revision": "332f6238064950a97bc3ed3f5421f6418537e707",
-			"revisionTime": "2017-04-21T21:58:51Z"
+			"revision": "6ac8c5d890d415025dd5aae7595bcb2a6e7e2fad",
+			"revisionTime": "2017-04-24T20:45:52Z"
 		},
 		{
 			"checksumSHA1": "uozMgPjB4AggpuuJkGq3FgAs4CA=",