hwmon: (ltc2991) Fix mixed signed/unsigned in DIV_ROUND_CLOSEST

Fix use of DIV_ROUND_CLOSEST where a possibly negative value is divided
by an unsigned type by casting the unsigned type to the signed type of
the same size (st->r_sense_uohm[channel] has type of u32).

The docs on the DIV_ROUND_CLOSEST macro explain that dividing a negative
value by an unsigned type is undefined behavior. The actual behavior is
that it converts both values to unsigned before doing the division, for
example:

    int ret = DIV_ROUND_CLOSEST(-100, 3U);

results in ret == 1431655732 instead of -33.

Fixes: 2b9ea42 ("hwmon: Add driver for ltc2991")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20250115-hwmon-ltc2991-fix-div-round-closest-v1-1-b4929667e457@baylibre.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: dlech

drivers/hwmon/ltc2991.c

@@ -125,7 +125,7 @@ static int ltc2991_get_curr(struct ltc2991_state *st, u32 reg, int channel,
 
 	/* Vx-Vy, 19.075uV/LSB */
 	*val = DIV_ROUND_CLOSEST(sign_extend32(reg_val, 14) * 19075,
-				 st->r_sense_uohm[channel]);
+				 (s32)st->r_sense_uohm[channel]);
 
 	return 0;
 }