aux/vbuf: prevent uint underflow and assert if no vbs are dirty
if this mask is 0, there is nothing to do here
Fixes: e73bf3b8 ("gallium: add start_slot parameter to set_vertex_buffers")
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if this mask is 0, there is nothing to do here
Fixes: e73bf3b8 ("gallium: add start_slot parameter to set_vertex_buffers")