rpmbuild: Fix cmdline lookup

Fixes issue #2272

Signed-off-by: Michal Berger <michalx.berger@intel.com>
Change-Id: I8845e4cb194c00eaaaa5e2a6c799ca32ba4b9335
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10591
Reviewed-by: <yex.chen@intel.com>
Reviewed-by: Dong Yi <dongx.yi@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

rpmbuild/rpm.sh

@@ -68,7 +68,7 @@ get_version() {
 build_rpm() (
 	local macros=() dir
 
-	macros+=(-D "configure $configure")
+	macros+=(-D "configure ${configure:-"%{nil}"}")
 	macros+=(-D "make $make")
 	macros+=(-D "release $release")
 	macros+=(-D "version $version")
@@ -128,7 +128,7 @@ build_rpm() (
 )
 
 # .spec defaults
-configure=${*:-"%{nil}"}
+configure=$*
 deps=${DEPS:-yes}
 make="${MAKEFLAGS:--j $(nproc)}"
 release=${RPM_RELEASE:-1}