sfc: Work around bogus 'uninitialised variable' warning
With some gcc versions & optimisations, the compiler will warn that 'depth' in efx_filter_insert_filter() may be used without being initialised, although this is not the case. This is related to inlining of efx_filter_search(), which only has one caller since commit 8db182f4 ('sfc: Remove now-unused filter function'). Shut the compiler up by initialising it to 0. Signed-off-by:Ben Hutchings <bhutchings@solarflare.com>
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