[Vala] [PATCH] fix double free in x11.vapi

[Alexander Kurtz <kurtz alex googlemail com>]

Hi,

This works with Vala 0.10.4:

        $ cat test.vala 
        void main(){
                X.Display disp = new X.Display();
                stdout.printf("%s\n", disp.display_string());
        }
        $ valac --pkg=x11 test.vala && ./test 
        :0.0 
        $

This doesn't work with Vala 0.10.4:

        $ cat test.vala 
        void main(){
                X.Display disp = new X.Display();
                stdout.printf("%s\n", disp.display_string());
                stdout.printf("%s\n", disp.display_string());
        }
        $ valac --pkg=x11 test.vala && ./test 
        :0.0

        *** glibc detected *** ./test: double free or corruption (fasttop): 0x08509958 ***
        [...]

The attached patch fixes the issue for me. Please include it in master
if you have no objections.

Best regards

Alexander Kurtz

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