[PATCH] [RDP compositor] don't crash when the key file doesn't exist

[Dawid Gajownik]

On Sat, Aug 1, 2015 at 7:35 PM, David FORT <rdp.effort at gmail.com> wrote:
> This allows to close the remaining issue in
> https://bugs.freedesktop.org/show_bug.cgi?id=91390

I'm a newbie here so I don't think I can make reviews but the patch
works fine for me.

[12:56:36.661] Loading module '/home/user/usr/lib/weston/desktop-shell.so'
[12:56:36.662] launching '/home/user/usr/libexec/weston-desktop-shell'
[12:56:39:606] [4346:4346] [ERROR][com.freerdp.core] - unable to open
RSA key file : No such file or directory.
[12:56:39:606] [4346:4346] [ERROR][com.freerdp.core.peer] - invalid RDP key file
[12:56:39.049] peer initialization failed
[12:56:39.050] error when treating incoming peer

Tested-by: Dawid Gajownik <gajownik at gmail.com>