updated cargo build

Author: prasad-shirodkar

buildrpm/virtiofsd.spec

@@ -44,7 +44,7 @@ tree with a guest.
 %setup -q -n %{name}-%{version}
 
 %build
-%cargo_build
+cargo build --release
 
 %install
 mkdir -p %{buildroot}%{_libexecdir}