Avoid unnecessary failures of auto-saving after fatal error

* src/w32.c (map_w32_filename): Avoid non-trivial system calls for
the benefit of FAT volumes if we are called as part of shutting
down due to a fatal error, which probably means we are trying to
auto-save the session.
* src/lread.c (check_obarray): Don't bother making the obarray
valid if we are shutting down due to a fatal error.  This avoids
interfering with auto-saving the crashed session.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/w32.c b/src/w32.c
index c77ed87b003..4770718f5e3 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -3210,7 +3210,8 @@ map_w32_filename (const char * name, const char ** pPath)
       return shortname;
     }
 
-  if (is_fat_volume (name, (const char **)&path)) /* truncate to 8.3 */
+  if (!fatal_error_in_progress  /* disable fancy processing during crash */
+      && is_fat_volume (name, (const char **)&path)) /* truncate to 8.3 */
     {
       register int left = 8;    /* maximum number of chars in part */
       register int extn = 0;    /* extension added? */