Avoid a compiler warning about a potentially unused variable.
There is no assignment to the "ret" variable if X_DRI2SwapBuffers is not defined. In this case, the earlier explicit "return 0" is likely to be used, but the compiler can't be sure of that, (nor can I for that matter). We cover this case by explicitly initializing "ret" to 0.
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@ -494,7 +494,7 @@ dri2SwapBuffers(__GLXDRIdrawable *pdraw, int64_t target_msc, int64_t divisor,
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struct dri2_screen *psc = (struct dri2_screen *) priv->base.psc;
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struct dri2_display *pdp =
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(struct dri2_display *)dpyPriv->dri2Display;
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CARD64 ret;
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CARD64 ret = 0;
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#ifdef __DRI2_FLUSH
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if (psc->f)
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