Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 93c28a1..80920bc 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2324,7 +2324,7 @@
 
 		/*
 		 * if ret == 0 means we found what we were searching for, which
-		 * is weird, but possible, so only screw with path if we didnt
+		 * is weird, but possible, so only screw with path if we didn't
 		 * find the key and see if we have stuff that matches
 		 */
 		if (ret > 0) {