qtime (fix)

[Luiz H. deFigueiredo]

SHAME!
While correcting a bug and doing some cleanup, I ended up introducing
a (rather silly) bug.

All three occurences of NULL should be "" , as in the original source.

Thanks to flong at sdsu.edu (Fred J. E. Long) for pointing this out.

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Luiz Henrique de Figueiredo		internet: lhf at aries5.uwaterloo.ca
Computer Systems Group			bitnet:   lhf at watcsg.bitnet
University of Waterloo
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