Fix 'make check' breakage with -j8
Fix 'make check' breakage with -j8

Signed-off-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@kernel.org>

fengzhyuan/libtrading,divaykin/libtrading,penberg/libtrading,jvirtanen/libtrading,libtrading/libtrading,svdev/libtrading,Bitcoinsulting/libtrading,mstanichenko/libtrading,Bitcoinsulting/libtrading,mstanichenko/libtrading,femtotrader/libtrading,libtrading/libtrading,svdev/libtrading,etoestja/libtrading,penberg/libtrading,jvirtanen/libtrading,NunoEdgarGub1/libtrading,fengzhyuan/libtrading,etoestja/libtrading,NunoEdgarGub1/libtrading,femtotrader/libtrading,divaykin/libtrading