i965: Delete a batch size assertion that isn't very useful.

This assertion prevents you from doing intel_batchbuffer_require_space
with a size so huge it won't fit in the batchbuffer.  This doesn't seem
like a common mistake, and I've never seen the assert to be useful.

Soon, I hope to have batches grow, at which point this won't make sense.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

src/mesa/drivers/dri/i965/intel_batchbuffer.c

@@ -238,9 +238,6 @@ intel_batchbuffer_require_space(struct brw_context *brw, GLuint sz,
       intel_batchbuffer_flush(brw);
    }
 
-#ifdef DEBUG
-   assert(sz < BATCH_SZ - BATCH_RESERVED);
-#endif
    if (intel_batchbuffer_space(&brw->batch) < sz)
       intel_batchbuffer_flush(brw);