(read_header): Give fatal error if input has no header.

lib-src/ChangeLog

@@ -1,3 +1,7 @@
+2006-04-29  Richard Stallman  <rms@gnu.org>
+
+	* fakemail.c (read_header): Give fatal error if input has no header.
+
 2006-04-02  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* b2m.c (main): Don't include <limits.h>.

lib-src/fakemail.c

@@ -694,6 +694,8 @@ read_header ()
 
     } while (true);
 
+  if (! the_header)
+    fatal ("input message has no header");
   return the_header->next;
 }