Linux 3.13 compat: Remove unused flags variable from __cv_init()

GCC 4.8.1 complained about an unused flags variable when building
against Linux 2.6.26.8:

/var/tmp/portage/sys-kernel/spl-9999/work/spl-9999/module/spl/../../module/spl/spl-condvar.c:
In function ‘__cv_init’:
/var/tmp/portage/sys-kernel/spl-9999/work/spl-9999/module/spl/../../module/spl/spl-condvar.c:39:6:
error: variable ‘flags’ set but not used
[-Werror=unused-but-set-variable]
  int flags = KM_SLEEP;
        ^
	cc1: all warnings being treated as errors

Additionally, the superfluous code uses a preempt_count variable that is
no longer available on Linux 3.13. Deleting the unnecessary code fixes a
Linux 3.13 compatibility issue.

Signed-off-by: Richard Yao <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #312

module/spl/spl-condvar.c

@@ -36,8 +36,6 @@
 void
 __cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg)
 {
-	int flags = KM_SLEEP;
-
 	SENTRY;
 	ASSERT(cvp);
 	ASSERT(name == NULL);
@@ -51,12 +49,6 @@ __cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg)
 	atomic_set(&cvp->cv_refs, 1);
 	cvp->cv_mutex = NULL;
 
-        /* We may be called when there is a non-zero preempt_count or
-	 * interrupts are disabled is which case we must not sleep.
-	 */
-        if (current_thread_info()->preempt_count || irqs_disabled())
-		flags = KM_NOSLEEP;
-
 	SEXIT;
 }
 EXPORT_SYMBOL(__cv_init);