hwmon: (f71882fg) Fix fan_to/from_reg prototypes

The RPM after conversion from / before conversion to a register value can be
much more than 65535 (up to 1500000), so putting this into an u16 can cause
overflows. This changes the functions to use an int to store / get RPM instead.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/f71882fg.c

@@ -810,12 +810,12 @@ static inline void superio_exit(int base)
 	outb(SIO_LOCK_KEY, base);
 }
 
-static inline u16 fan_from_reg(u16 reg)
+static inline int fan_from_reg(u16 reg)
 {
 	return reg ? (1500000 / reg) : 0;
 }
 
-static inline u16 fan_to_reg(u16 fan)
+static inline u16 fan_to_reg(int fan)
 {
 	return fan ? (1500000 / fan) : 0;
 }