mesa: change invalid texture swizzle error to GL_INVALID_ENUM

The original GL_EXT_texture_swizzle extensions said GL_INVALID_OPERATION
was to be generated when the an invalid swizzle was passed to
glTexParameter().  But in OpenGL 3.3 and later, the error should be
GL_INVALID_ENUM.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
1 file changed