Revert "label: fix systemd-udev labeling of /run directory."

This reverts commit 9b5af248f0.

Udev now explicitely labels only files/directories in /dev. The selinux
array API is not released and will not work on other distros at this moment.

src/shared/label.c

@@ -52,7 +52,7 @@ void label_retest_selinux(void) {
 
 #endif
 
-int label_init(const char *prefixes[]) {
+int label_init(const char *prefix) {
         int r = 0;
 
 #ifdef HAVE_SELINUX
@@ -68,9 +68,9 @@ int label_init(const char *prefixes[]) {
         before_mallinfo = mallinfo();
         before_timestamp = now(CLOCK_MONOTONIC);
 
-        if (prefixes) {
+        if (prefix) {
                 struct selinux_opt options[] = {
-                        { .type = SELABEL_OPT_SUBSET, .values = prefixes },
+                        { .type = SELABEL_OPT_SUBSET, .value = prefix },
                 };
 
                 label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options));

src/shared/label.h

@@ -26,7 +26,7 @@
 #include <stdbool.h>
 #include <sys/socket.h>
 
-int label_init(const char *prefixes[]);
+int label_init(const char *prefix);
 void label_finish(void);
 
 int label_fix(const char *path, bool ignore_enoent);