jimtcl: add error handling to for loop

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/jimtcl/jimtcl.mk

@@ -51,7 +51,7 @@ endef
 
 define JIMTCL_INSTALL_STAGING_CMDS
 	for i in $(JIMTCL_HEADERS_TO_INSTALL); do \
-		cp -a $(@D)/$$i $(STAGING_DIR)/usr/include/ ; \
+		cp -a $(@D)/$$i $(STAGING_DIR)/usr/include/ || exit 1 ; \
 	done; \
 	$(INSTALL) -D $(@D)/libjim.$(JIMTCL_LIB) $(STAGING_DIR)/usr/lib/libjim.$(JIMTCL_LIB);
 	ln -s libjim.$(JIMTCL_LIB) $(STAGING_DIR)/usr/lib/libjim.so