Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 6ea0073..82a6646 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -523,7 +523,7 @@
 		goto out;
 
 	/*
-	 * Page writeback can extend beyond the liftime of the
+	 * Page writeback can extend beyond the lifetime of the
 	 * page-cache page, so make sure we read a properly synced
 	 * page.
 	 */