iwlegacy: remove redundant assignment to *res

Currently 1 is being assigned to *res and then it is immediately
updated with the computed result.  The first assignment is
redundant and can be removed.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/intel/iwlegacy/4965.c

@@ -577,7 +577,6 @@ il4965_math_div_round(s32 num, s32 denom, s32 * res)
 		sign = -sign;
 		denom = -denom;
 	}
-	*res = 1;
 	*res = ((num * 2 + denom) / (denom * 2)) * sign;
 
 	return 1;