Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c
index 28ccab4..53b2c5a 100644
--- a/drivers/video/vga16fb.c
+++ b/drivers/video/vga16fb.c
@@ -152,7 +152,7 @@
 }
 
 /* Set the Enable Set/Reset Register and return its old value.  
-   The code here always uses value 0xf for thsi register. */
+   The code here always uses value 0xf for this register. */
 static inline int setsr(int sr)
 {
 	int oldsr;