Fix misspellings using 'codespell' tool

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/verify.c b/verify.c
index 9e88d61..0d38c0e 100644
--- a/verify.c
+++ b/verify.c
@@ -124,7 +124,7 @@
 }
 
 /*
- * Prepare for seperation of verify_header and checksum header
+ * Prepare for separation of verify_header and checksum header
  */
 static inline unsigned int __hdr_size(int verify_type)
 {