TAKE - Improvement request for xfsdump/xfsrestore exit codes

[Andrew Gildfind <ajag@xxxxxxxxxxxxxxxxxxxxxxx>]

This fixes catches some user-initiated interruptions that were previously 
missed,
and fixes a coredump on linux.

Date:  Sun Oct  7 23:55:49 PDT 2001
Workarea:  snort.melbourne.sgi.com:/home/ajag/isms/slinx

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  2.4.x-xfs:slinx:104099a
cmd/xfsdump/restore/tree.c - 1.7
cmd/xfsdump/dump/inomap.c - 1.9
        - wrap previously missed call to exit()

cmd/xfsdump/common/types.h - 1.5
        - Add RV_EXISTS

cmd/xfsdump/common/mlog.c - 1.6
        - update mlog_exit_flush logic, catch some user interruptions that were 
previously
          missed

cmd/xfsdump/common/main.c - 1.14
        - wrap calls to exit() for miniroot/linux