igc: Reduce retry count to a more reasonable number

Setting the retry count to 8x is more than sufficient. 100x is unreasonable
 and would indicate broken hardware/firmware.

Fixes: a90ec84 ("igc: Add support for PTP getcrosststamp()")
Signed-off-by: Christopher S M Hall <[email protected]>

drivers/net/ethernet/intel/igc/igc_ptp.c

@@ -1076,8 +1076,8 @@ static int igc_phc_get_syncdevicetime(ktime_t *device,
 	u32 stat, t2_curr_h, t2_curr_l;
 	struct igc_adapter *adapter = ctx;
 	struct igc_hw *hw = &adapter->hw;
-	int err, count = 100;
 	ktime_t t1, t2_curr;
+	int err, count = 8;
 
 	/* Doing this in a loop because in the event of a
 	 * badly timed (ha!) system clock adjustment, we may