[PATCH] do not feed keyboard device path in X devd backend

[Robert Millan]

When feeding the keyboard device path (e.g. /dev/ukbd0) to X server,
it will attempt to open it. This is incorrect because X doesn't want
_all_ the input from keyboard but rather just the one typed in its
VT (usually /dev/ttyv7).

Plus, attempting to open /dev/ukbd0 usually fails with EBUSY as the
keyboard is already being used by syscons.

This patch adjusts devd.c to follow the same approach as HAL: detect
the keyboard but feed it a zero-length device path. The result is
that X detects the presence of a keyboard, and therefore loads the
kbd_drv module, but doesn't attempt to open it directly (which is
unnecessary since /dev/ttyv7 is already open).

-- 
Robert Millan
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