Fix misspelling of "should" and "shouldn't" in comments.

Some comments misspell "should" or "shouldn't"; this fixes them. No code changes.

Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/video/sstfb.c b/drivers/video/sstfb.c
index 609d0a5..79840f1 100644
--- a/drivers/video/sstfb.c
+++ b/drivers/video/sstfb.c
@@ -1102,7 +1102,7 @@
  * detect dac type
  * prerequisite : write to FbiInitx enabled, video and fbi and pci fifo reset,
  * dram refresh disabled, FbiInit remaped.
- * TODO: mmh.. maybe i shoud put the "prerequisite" in the func ...
+ * TODO: mmh.. maybe i should put the "prerequisite" in the func ...
  */