genprotimg: abort if one of the recursive targets is failing

Abort compilation as soon as one of the recursive targets is failing.

Fixes: 65b9fc4 ("genprotimg: introduce new tool for the creation of PV images")
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

genprotimg/Makefile

@@ -21,7 +21,7 @@ clean: clean-recursive
 $(RECURSIVE_TARGETS):
 	@target=`echo $@ |sed s/-recursive//`; \
 		for d in $(SUBDIRS); do \
-			$(MAKE) -C $$d $$target; \
+			$(MAKE) -C $$d $$target || exit 1; \
 		done
 
 .PHONY: all install clean $(RECURSIVE_TARGETS)