[PATCH] xf86: return NULL for xf86CompatOutput if config->compat_output is -1

[Keith Packard]

Aaron Plattner <aplattner at nvidia.com> writes:

> If there is no compat output, config->compat_output is -1 and xf86CompatOutput
> reads before the beginning of the outputs array.

Did you happen to review users of this function and make sure they all
handle NULL return values? The other 'obvious' return value would be to
just pick some output and hope it was reasonable, after all.

-- 
keith.packard at intel.com
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