xenbus_xs.c: fix a use-after-free
This patch fixes an obvious use-after-free spotted by the Coverity checker. Signed-off-by: Adrian Bunk <bunk@stusta.de> Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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