[Midnightbsd-cvs] src: mport.c: Use exec instead of system() so we can actually return

[laffer1 at midnightbsd.org]

Log Message:
-----------
Use exec instead of system() so we can actually return proper error codes.

Modified Files:
--------------
    src/usr.sbin/mport:
        mport.c (r1.9 -> r1.10)
        (http://cvsweb.midnightbsd.org/src/usr.sbin/mport/mport.c?r1=1.9&r2=1.10)