[PATCH] misc: suppress build warning

["Lad, Prabhakar" <prabhakar.csengg@gmail.com>]

this patch fixes following build warning:

drivers/misc/ioc4.c: In function ‘ioc4_probe’:
drivers/misc/ioc4.c:194:16: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  period = (end - start) /
                ^
drivers/misc/ioc4.c:148:11: note: ‘start’ was declared here
  uint64_t start, end, period;

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
---
 Note:- I have compile tested only, and this was noticed
 on linux-next

 drivers/misc/ioc4.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/ioc4.c b/drivers/misc/ioc4.c
index 3336ddc..c1f1e6c 100644
--- a/drivers/misc/ioc4.c
+++ b/drivers/misc/ioc4.c
@@ -145,7 +145,7 @@ ioc4_clock_calibrate(struct ioc4_driver_data *idd)
 	union ioc4_int_out int_out;
 	union ioc4_gpcr gpcr;
 	unsigned int state, last_state = 1;
-	uint64_t start, end, period;
+	uint64_t start = 0, end, period;
 	unsigned int count = 0;
 
 	/* Enable output */
-- 
1.9.1