Fix compilation warning in rmailmm

* lisp/mail/rmailmm.el (rmail-mime-insert-bulk): Remove apparently
superfluous call to string-as-unibyte -- the buffer should be
unibyte already at this point.

1 files changed, 2 insertions, 1 deletions

diff --git a/lisp/mail/rmailmm.el b/lisp/mail/rmailmm.el
index af528135ccb..95977e826d7 100644
--- a/lisp/mail/rmailmm.el
+++ b/lisp/mail/rmailmm.el
@@ -836,7 +836,8 @@ directly."
               size (car bulk-data))
       (if (stringp (aref body 0))
           (setq data (aref body 0))
-        (setq data (string-as-unibyte (buffer-string)))
+        (setq data (buffer-string))
+        (cl-assert (not (multibyte-string-p data)))
         (aset body 0 data)
         (rmail-mime-set-bulk-data entity)
         (delete-region (point-min) (point-max)))