Fix misspellings of "system", "controller", "interrupt" and "necessary".

Fix the various misspellings of "system", controller", "interrupt" and
"[un]necessary".

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/drivers/net/amd8111e.c b/drivers/net/amd8111e.c
index 1cc74ec..eebf5bb 100644
--- a/drivers/net/amd8111e.c
+++ b/drivers/net/amd8111e.c
@@ -1111,7 +1111,7 @@
 
 	return new_stats;
 }
-/* This function recalculate the interupt coalescing  mode on every interrupt
+/* This function recalculate the interrupt coalescing  mode on every interrupt
 according to the datarate and the packet rate.
 */
 static int amd8111e_calc_coalesce(struct net_device *dev)