tree-wide: fix assorted typos all over the place

That is "success", "unknown", "through", "performance", "[re|un]mapping"
, "access", "default", "reasonable", "[con]currently", "temperature"
, "channel", "[un]used", "application", "example","hierarchy", "therefore"
, "[over|under]flow", "contiguous", "threshold", "enough" and others.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c
index 2cd00b5..9fd4a0d 100644
--- a/drivers/ieee1394/dv1394.c
+++ b/drivers/ieee1394/dv1394.c
@@ -125,7 +125,7 @@
    0 - no debugging messages
    1 - some debugging messages, but none during DMA frame transmission
    2 - lots of messages, including during DMA frame transmission
-       (will cause undeflows if your machine is too slow!)
+       (will cause underflows if your machine is too slow!)
 */
 
 #define DV1394_DEBUG_LEVEL 0