glx_arb_create_context: Initialize variable.
Fix defect reported by Coverity Scan.
Uninitialized pointer read (UNINIT) uninit_use_in_call: Using uninitialized value ctx when calling glXDestroyContext.
Fixes: 4991384f ("glx: add test for GLX_ARB_create_context_no_error") Signed-off-by: Vinson Lee vlee@freedesktop.org