roundtrip: fix a typo in the make target

[masatake]

Signed-off-by: Masatake YAMATO yamato@redhat.com

[codecov]

Codecov Report

Merging #3124 (726fa6b) into master (24f8524) will not change coverage.
The diff coverage is n/a.

❗ Current head 726fa6b differs from pull request most recent head 9f04cd4. Consider uploading reports for the commit 9f04cd4 to get more accurate results

@@           Coverage Diff           @@
##           master    #3124   +/-   ##
=======================================
  Coverage   87.35%   87.35%           
=======================================
  Files         200      200           
  Lines       47839    47839           
=======================================
  Hits        41792    41792           
  Misses       6047     6047           

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