Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 07ee154..4515bea 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -1116,7 +1116,7 @@
 
 /*
  * On NAND we try to mark this block bad. If the block was erased more
- * than MAX_ERASE_FAILURES we mark it finaly bad.
+ * than MAX_ERASE_FAILURES we mark it finally bad.
  * Don't care about failures. This block remains on the erase-pending
  * or badblock list as long as nobody manipulates the flash with
  * a bootloader or something like that.