* fileio.c (Fverify_visited_file_modtime): Avoid time overflow

if b->modtime has its maximal value.

diff --cc src/ChangeLog
index 2d139e0,0d84500..ff36dd3
--- 1/src/ChangeLog
--- 2/src/ChangeLog
+++ b/src/ChangeLog
@@@ -1,5 -1,8 +1,8 @@@
 -2011-06-02  Paul Eggert  <eggert@cs.ucla.edu>
 +2011-06-03  Paul Eggert  <eggert@cs.ucla.edu>
  
+       * fileio.c (Fverify_visited_file_modtime): Avoid time overflow
+       if b->modtime has its maximal value.
+ 
        * dired.c (Ffile_attributes): Don't assume EMACS_INT has >32 bits.
  
        * lisp.h: Include <intprops.h>, as it'll useful in later changes.