Bug#1010418: Fixed loop

[Sergio Costas]

Ok, I modified the loop. Now it will gracefully fail if get_user_name() 
returns something that isn't in /etc/passwd:

boolfound = false;
unowned Posix.Passwdpasswd;
Posix.setpwent();
while(null!= (passwd = Posix.getpwent())) {
if(passwd.pw_name == GLib.Environment.get_user_name()) {
found = true;
cmd += passwd.pw_shell;
break;
}
}
if(!found) {
cmd += "/bin/sh";
}
Posix.endpwent();
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