Nit: fix use of bufio.Scanner.Err

The Err() method should be called after the Scan() loop, not inside it.

Found by: git grep -A3 -F '.Scan()'

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

mount/mountinfo_linux.go

@@ -45,10 +45,6 @@ func parseInfoFile(r io.Reader) ([]Info, error) {
 	out := []Info{}
 	var err error
 	for s.Scan() {
-		if err = s.Err(); err != nil {
-			return nil, err
-		}
-
 		/*
 		   See http://man7.org/linux/man-pages/man5/proc.5.html
 
@@ -128,6 +124,10 @@ func parseInfoFile(r io.Reader) ([]Info, error) {
 
 		out = append(out, p)
 	}
+	if err = s.Err(); err != nil {
+		return nil, err
+	}
+
 	return out, nil
 }