lrz: Does not remove incomplete file

[ole-tange]

Compare:

gzip foo & pid=$!; sleep 1; kill $!; ls -l foo*
lrz foo & pid=$!; sleep 1; kill $!; ls -l foo*

lrz -d foo.lrz & pid=$!; sleep 1; kill $!; ls -l foo*
gzip -d foo.gz & pid=$!; sleep 1; kill $!; ls -l foo*

foo{.gz,.lrz,} are big files that cannot be (de)compressed in a single second.

To make it more compatible with gzip incomplete files should be removed.

[ckolivas]

Fixed in git master.