label: move label_ops_reset() up a bit

Let#s move it close to label_ops_set(), since it is somewhat symmetric
to it.

src/basic/label.c

@@ -18,6 +18,10 @@ int label_ops_set(const LabelOps *ops) {
         return 0;
 }
 
+void label_ops_reset(void) {
+        label_ops = NULL;
+}
+
 int label_ops_pre(int dir_fd, const char *path, mode_t mode) {
         if (!label_ops || !label_ops->pre)
                 return 0;
@@ -31,7 +35,3 @@ int label_ops_post(int dir_fd, const char *path, bool created) {
 
         return label_ops->post(dir_fd, path, created);
 }
-
-void label_ops_reset(void) {
-        label_ops = NULL;
-}

src/basic/label.h

@@ -10,8 +10,7 @@ typedef struct LabelOps {
 } LabelOps;
 
 int label_ops_set(const LabelOps *label_ops);
+void label_ops_reset(void);
 
 int label_ops_pre(int dir_fd, const char *path, mode_t mode);
 int label_ops_post(int dir_fd, const char *path, bool created);
-
-void label_ops_reset(void);