raid6check: Fix build of raid6check

After recent git pull 'make raid6check' did not work anymore, as
sysfs_read() was called with a wrong argument and as check_env()
was used by use_udev(), but not defined.

Replace sysfs_read(..., -1, ...) by sysfs_read(..., NULL, ...)

Move check_env() from util.c to lib.c

Signed-off-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Signed-off-by: NeilBrown <neilb@suse.de>

lib.c

@@ -378,6 +378,16 @@ void print_escape(char *str)
 	}
 }
 
+int check_env(char *name)
+{
+	char *val = getenv(name);
+
+	if (val && atoi(val) == 1)
+		return 1;
+
+	return 0;
+}
+
 int use_udev(void)
 {
 	static int use = -1;

raid6check.c

@@ -386,7 +386,7 @@ int main(int argc, char *argv[])
 		goto exitHere;
 	}
 
-	info = sysfs_read(mdfd, -1,
+	info = sysfs_read(mdfd, NULL,
 			  GET_LEVEL|
 			  GET_LAYOUT|
 			  GET_DISKS|

util.c

@@ -1798,16 +1798,6 @@ int start_mdmon(char *devnm)
 	return 0;
 }
 
-int check_env(char *name)
-{
-	char *val = getenv(name);
-
-	if (val && atoi(val) == 1)
-		return 1;
-
-	return 0;
-}
-
 __u32 random32(void)
 {
 	__u32 rv;