egl/dri2: drop NULL checks prior to dri2_destroy_surface
egl/dri2: drop NULL checks prior to dri2_destroy_surface

The function already have the respective check within.

Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler