xen: use 'time_left' variable with wait_* functions

There is a confusing pattern in the kernel to use a variable named
'timeout' to store the result of wait_for_completion_timeout() or
wait_event_interruptible_timeout() causing patterns like:

	timeout = wait_for_completion_timeout(...)
	if (!timeout) return -ETIMEDOUT;

with all kinds of permutations. Use 'time_left' as a variable to make the code
self explaining.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
1 file changed