mesa: check draw buffer completeness on glClearBufferfv/glClearBufferuiv
Tests for fix cases here link.
From OpenGL 4.6, section 9.4.4 "Effects of Framebuffer Completeness on Framebuffer Operations", page 332: "An INVALID_FRAMEBUFFER_OPERATION error is generated by attempts to render to or read from a framebuffer which is not framebuffer complete. This error is generated regardless of whether fragments are actually read from or written to the framebuffer. For example, it is generated when a rendering command is called and the framebuffer is incomplete, even if RASTERIZER_DISCARD is enabled."
Signed-off-by: Dmytro Nester firstname.lastname@example.org