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

module/zfs/zfs_byteswap.c

@@ -30,6 +30,9 @@
 #include <sys/zfs_sa.h>
 #include <sys/zfs_acl.h>
 
+#ifndef _KERNEL
+static
+#endif
 void
 zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
 {
@@ -46,6 +49,9 @@ zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
 /*
  * swap ace_t and ace_object_t
  */
+#ifndef _KERNEL
+static
+#endif
 void
 zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
 {