Fix a fat-fingered invocation of tap-merge.pl in the recipe of target
check-report.tap.

Fixes: 9df43317 "test: replace gtester with a TAP driver"
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190604080010.23186-1-armbru@redhat.com>
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>