Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index 0d06f4e..8f44cef 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -850,7 +850,7 @@
 		rsv_window_remove(sb, my_rsv);
 
 	/*
-	 * Let's book the whole avaliable window for now.  We will check the
+	 * Let's book the whole available window for now.  We will check the
 	 * disk bitmap later and then, if there are free blocks then we adjust
 	 * the window size if it's larger than requested.
 	 * Otherwise, we will remove this node from the tree next time
@@ -1357,9 +1357,9 @@
 			goto allocated;
 	}
 	/*
-	 * We may end up a bogus ealier ENOSPC error due to
+	 * We may end up a bogus earlier ENOSPC error due to
 	 * filesystem is "full" of reservations, but
-	 * there maybe indeed free blocks avaliable on disk
+	 * there maybe indeed free blocks available on disk
 	 * In this case, we just forget about the reservations
 	 * just do block allocation as without reservations.
 	 */