Fix spelling

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Haakan T Johansson <f96hajo@chalmers.se>
Closes #5547 
Closes #5543

lib/libspl/include/sys/dkio.h

@@ -158,7 +158,7 @@ struct dk_geom {
 
 /*
  * The following ioctls are generic in nature and need to be
- * suported as appropriate by all disk drivers
+ * supported as appropriate by all disk drivers
  */
 #define	DKIOCGGEOM	(DKIOC|1)		/* Get geometry */
 #define	DKIOCINFO	(DKIOC|3)		/* Get info */

lib/libspl/include/sys/dklabel.h

@@ -107,7 +107,7 @@ struct dk_map2 {
 
 struct dkl_partition    {
 	uint16_t	p_tag;		/* ID tag of partition */
-	uint16_t	p_flag;		/* permision flags */
+	uint16_t	p_flag;		/* permission flags */
 	daddr32_t	p_start;	/* start sector no of partition */
 	int32_t		p_size;		/* # of blocks in partition */
 };