lib/list: remove LIST_HEAD macro

* the variable definition with hidden type is always horrible, for
  example:

	  int func() {
	    LIST_HEAD(foo);
	    ...
	  }

  the more readable is:

          int func() {
            struct list_head foo;

            INIT_LIST_HEAD(&foo);
            ...
          }

* the name LIST_HEAD conflict with /usr/include/sys/queue.h

* we use it only on two places in sulogin

Signed-off-by: Karel Zak <kzak@redhat.com>

include/list.h

@@ -33,11 +33,6 @@ struct list_head {
 	struct list_head *next, *prev;
 };
 
-#define LIST_HEAD_INIT(name) { &(name), &(name) }
-
-#define LIST_HEAD(name) \
-	struct list_head name = LIST_HEAD_INIT(name)
-
 #define INIT_LIST_HEAD(ptr) do { \
 	(ptr)->next = (ptr); (ptr)->prev = (ptr); \
 } while (0)

login-utils/sulogin-consoles.c

@@ -802,8 +802,7 @@ int main(int argc, char *argv[])
 {
 	char *name = NULL;
 	int fd, re;
-	LIST_HEAD(consoles);
-	struct list_head *p;
+	struct list_head *p, consoles;
 
 	if (argc == 2) {
 		name = argv[1];
@@ -816,6 +815,7 @@ int main(int argc, char *argv[])
 	if (!name)
 		errx(EXIT_FAILURE, "usage: %s [<tty>]\n", program_invocation_short_name);
 
+	INIT_LIST_HEAD(&consoles);
 	re = detect_consoles(name, fd, &consoles);
 
 	list_for_each(p, &consoles) {

login-utils/sulogin.c

@@ -827,8 +827,7 @@ static void usage(FILE *out)
 
 int main(int argc, char **argv)
 {
-	LIST_HEAD(consoles);
-	struct list_head *ptr;
+	struct list_head *ptr, consoles;
 	struct console *con;
 	char *tty = NULL;
 	struct passwd *pwd;
@@ -849,6 +848,8 @@ int main(int argc, char **argv)
 		{ NULL,           0, 0, 0 }
 	};
 
+	INIT_LIST_HEAD(&consoles);
+
 	/*
 	 * If we are init we need to set up a own session.
 	 */