Fix typos in doc and comments

Changes persistant -> persistent. www.dictionary.com does not know
persistant (with an A), but should it be one of those things you can
spell in more than one correct way, let me know.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index 2f880cb..0cad354 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -120,7 +120,7 @@
 	/* These are synchronization calls between various UML threads on the
 	 * host - since they are not different kernel threads, we cannot use
 	 * kernel semaphores. We don't use SysV semaphores because they are
-	 * persistant. */
+	 * persistent. */
 	count = os_read_file(pipe_fd, &c, sizeof(c));
 	if(count != sizeof(c))
 		printk("winch_thread : failed to read synchronization byte, "