9pfs: drop useless v9fs_string_null() function
The v9fs_string_null() function just calls v9fs_string_free(). Also it only has 4 users, whereas v9fs_string_free() has 87. This patch converts users to call directly v9fs_string_free() and drops the useless function. Signed-off-by:Greg Kurz <groug@kaod.org> Reviewed-by:
Cédric Le Goater <clg@kaod.org>
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