eglvivsink: factored out get_error_string() function

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
eglvivsink: added FB platform support

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
eglvivsink: catch cases for aspect ratio where width & height are 0

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
eglvivsink: scope fix

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>