i965: Don't cast the result of brw_prepare_vertices to an unsigned value.
Negative value means other errors, not aperture overflow. fix bug #15752
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@ -257,10 +257,12 @@ static GLboolean brw_try_draw_prims( GLcontext *ctx,
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struct intel_context *intel = intel_context(ctx);
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struct brw_context *brw = brw_context(ctx);
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GLboolean retval = GL_FALSE;
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GLuint i, ret;
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GLuint i;
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GLuint ib_offset;
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dri_bo *ib_bo;
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GLboolean force_flush = GL_FALSE;
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int ret;
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if (ctx->NewState)
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_mesa_update_state( ctx );
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