lib/sysfs.c: Fix no sensors being reported as an error.

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4041 7894878c-1315-0410-8ee3-d5d059ff63e0

CHANGES

@@ -7,6 +7,7 @@ lm_sensors CHANGES file
            Add support for W83627EHF voltage inputs and alarms
            Add support for the smsc47m192 driver
            Fix all memory leaks (yeah!)
+           Fix no sensors being reported as an error
   Makefile: Don't grep autoconf.h on user-space targets
   Makefile: Fix depmod on non-running kernel version
   Module i2c-ali1535: Drop redundant semaphore (2.6 backport)

lib/sysfs.c

@@ -112,7 +112,8 @@ static int sensors_read_sysfs_chips_compat(void)
 	}
 
 	if (!(devs = sysfs_get_bus_devices(bus))) {
-		ret = -SENSORS_ERR_PROC;
+		if (errno)
+			ret = -SENSORS_ERR_PROC;
 		goto exit1;
 	}
 
@@ -142,7 +143,8 @@ int sensors_read_sysfs_chips(void)
 	}
 
 	if (!(clsdevs = sysfs_get_class_devices(cls))) {
-		ret = -SENSORS_ERR_PROC;
+		if (errno)
+			ret = -SENSORS_ERR_PROC;
 		goto exit;
 	}