5bbb6b3eb8
Restore an splx() lost in r228644. We aren't nearly ready to remove spl's. They give hints about missing locking. This lost one was misplaced. Dropping it early for convenience gave race windows for accesses to the fkey buffer. Giant locking accidentally fixed this for non-console cases. Put the spl's around the whole function. Since there are many returns that would need splx() just before them for a direct fix, split the function into a wrapper that does the spl's and a "locked" function that does the work. Return earlier when no keyboard is attached to match the ordering in a planned version. This breaks the dubious feature of returning keys from the fkey buffer after the keyboard has gone away. Losing the keys wouldn't matter, but we keep them too long now.
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