hwmon: (emc6w201) Do not declare enum variable

Fix the following smatch warning:

emc6w201.c:52:26: warning: symbol 'subfeature' was not declared.
Should it be static?

'enum { } subtype' declares an enum as (global) variable which we don't want.
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

drivers/hwmon/emc6w201.c

@@ -49,7 +49,7 @@ static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
 #define EMC6W201_REG_TEMP_HIGH(nr)	(0x57 + (nr) * 2)
 #define EMC6W201_REG_FAN_MIN(nr)	(0x62 + (nr) * 2)
 
-enum { input, min, max } subfeature;
+enum subfeature { input, min, max };
 
 /*
  * Per-device data