Fix Debian bug #425129: SMB guest mode won't work

| The check_disk_smb plugin purports to support guest users, but it
| doesn't work out, because it doesn't specify the -N command line
| option to smbclient when no password is specified, making smbclient
| stop and ask.

[ http://bugs.debian.org/425129 ]

(Fixed by Josip Rodin, forwarded by Jan Wagner.)

NEWS

@@ -14,6 +14,7 @@ This file documents the major additions and syntax changes between releases.
 	Fix compilation with GCC 2.96 (Konstantin Khomoutov - #2977105)
 	Fix regression introduced in #1867716 where partially valid performance strings would not be printed anymore
 	Fix regression in check_http ssl checks on some servers - make SNI an option
+	Fix guest mode support in check_disk_smb
 	WARNINGS
 	Updated developer documentation to say that performance labels should not have an equals sign or
 	single quote in the label

THANKS.in

@@ -260,3 +260,4 @@ Marcel Kuiper
 Bryan Irvine
 Jimmy Bergman
 Konstantin Khomoutov
+Josip Rodin

plugins-scripts/check_disk_smb.pl

@@ -78,6 +78,7 @@ my $user = $1 if ($opt_u =~ /^([-_.A-Za-z0-9\\]+)$/);
 
 ($opt_p) || ($opt_p = shift) || ($opt_p = "");
 my $pass = $1 if ($opt_p =~ /(.*)/);
+$pass = "-N" if ($opt_p eq "");
 
 ($opt_w) || ($opt_w = shift) || ($opt_w = 85);
 my $warn = $1 if ($opt_w =~ /^([0-9]{1,2}\%?|100\%?|[0-9]+[kMG])$/);