Mark functions as static

Mark functions used only in the same translation unit as static. This
only includes functions that do not have a prototype in a header file
either.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Closes #10470

cmd/zed/agents/zfs_mod.c

@@ -533,7 +533,7 @@ zfs_iter_vdev(zpool_handle_t *zhp, nvlist_t *nvl, void *data)
 	(dp->dd_func)(zhp, nvl, dp->dd_islabeled);
 }
 
-void
+static void
 zfs_enable_ds(void *arg)
 {
 	unavailpool_t *pool = (unavailpool_t *)arg;

cmd/zed/zed_strings.c

@@ -108,7 +108,7 @@ _zed_strings_node_destroy(zed_strings_node_t *np)
  * If [key] is specified, it will be used to index the node; otherwise,
  * the string [val] will be used.
  */
-zed_strings_node_t *
+static zed_strings_node_t *
 _zed_strings_node_create(const char *key, const char *val)
 {
 	zed_strings_node_t *np;