Assert mutt_decode_attachment() doesn't modify body fields.

Some old smime (and other parts of the code) have out of date comments
asserting mutt_decode_attachment() modifies the body length, offset,
and type fields.

Add a const modifier to the parameter and called functions to assert
this is not the case.

1 files changed, 1 insertions, 1 deletions

diff --git a/handler.c b/handler.c
index 8d27ff5e..d1b4bc73 100644
--- a/handler.c
+++ b/handler.c
@@ -1545,7 +1545,7 @@ static int external_body_handler (BODY *b, STATE *s)
   return 0;
 }
 
-void mutt_decode_attachment (BODY *b, STATE *s)
+void mutt_decode_attachment (const BODY *b, STATE *s)
 {
   int istext = mutt_is_text_part (b);
   iconv_t cd = (iconv_t)(-1);