selftests: ublk: remove useless 'delay_us' from 'struct dev_ctx'

'delay_us' shouldn't be added to 'struct dev_ctx' since now it is
handled by per-target command line & 'struct fault_inject_ctx'.

So remove it.

Fixes: 8158665 ("selftests: ublk: add generic_06 for covering fault inject")
Signed-off-by: Ming Lei <[email protected]>
Reviewed-by: Uday Shankar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Ming Lei

tools/testing/selftests/ublk/kublk.h

@@ -86,9 +86,6 @@ struct dev_ctx {
 	unsigned int	fg:1;
 	unsigned int	recovery:1;
 
-	/* fault_inject */
-	long long	delay_us;
-
 	int _evtfd;
 	int _shmid;