Resolve "modbuild: cleanup source and build directory before and after building"

Pmodules/libpbuild.bash

@@ -1570,7 +1570,7 @@ _build_module() {
 	}
 
 	cleanup_build() {
-		[[ ${enable_cleanup_build} == yes ]] || return 0
+		[[ ${enable_cleanup_build} != 'yes' ]] && return 0
 		[[ "${BUILD_DIR}" == "${SRC_DIR}" ]] && return 0
 		{
 			cd "/${BUILD_DIR}/.." || std::die 42 "Internal error"
@@ -1590,7 +1590,7 @@ _build_module() {
 	}
 
 	cleanup_src() {
-		[[ ${enable_cleanup_src} == yes ]] || return 0
+		[[ ${enable_cleanup_src} != 'yes' ]] && return 0
     		{
 			cd "/${SRC_DIR}/.." || std::die 42 "Internal error"
 			[[ $(pwd) == / ]] && \
@@ -1799,6 +1799,8 @@ _build_module() {
 			"%s " \
 			"${module_name}/${module_version}:" \
 			"start building ..."
+		cleanup_build
+		cleanup_src
 		compile_and_install
 		post_install
 	fi