[ARM] APM: "Battery life" needs to be a signed integer.

arch/arm/kernel/apm.c

@@ -433,7 +433,7 @@ static int apm_get_info(char *buf, char **start, off_t fpos, int length)
 	info.ac_line_status = 0xff;
 	info.battery_status = 0xff;
 	info.battery_flag   = 0xff;
-	info.battery_life   = 255;
+	info.battery_life   = -1;
 	info.time	    = -1;
 	info.units	    = -1;
 

include/asm-arm/apm.h

@@ -41,7 +41,7 @@ struct apm_power_info {
 	unsigned char	ac_line_status;
 	unsigned char	battery_status;
 	unsigned char	battery_flag;
-	unsigned char	battery_life;
+	int		battery_life;
 	int		time;
 	int		units;
 };