fix the "index out of range" error when the length of speed is 0.

Signed-off-by: huaxiao <[email protected]>

Author: huaxiao

pkg/netutils/netutils.go

@@ -98,6 +98,9 @@ func NetLimit() *rate.Rate {
 				continue
 			}
 			speed := compile.FindStringSubmatch(fields[1])
+			if len(speed) == 0 {
+				continue
+			}
 			if tmpLimit, err := strconv.ParseUint(speed[1], 0, 32); err == nil {
 				tmpLimit = tmpLimit / 8
 				if tmpLimit > maxInterfaceLimit {