[SCSI] zfcp: Remove duplicated code for debug timestamps

The timestamp calculation used for s390dbf output is the same in a
private zfcp function and in debug.c. Replace both with a common
inline function.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index d4c8e9c..9693d98 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -90,6 +90,7 @@
 	todval -= (sec * 1000000) << 12;
 	xtime->tv_nsec = ((todval * 1000) >> 12);
 }
+EXPORT_SYMBOL(tod_to_timeval);
 
 void clock_comparator_work(void)
 {