[build]: fix dpkg uninstall bug

fix a bug when there are multiple debian packages to be uninstalled

Signed-off-by: Guohan Lu <lguohan@gmail.com>

rules/functions

@@ -112,13 +112,13 @@ expand = $(foreach d,$(1),$(call expand,$($(d)_$(2)),$(2))) $(1)
 ## Uninstall debs
 ###############################################################################
 define UNINSTALL_DEBS
-$(info $(1))
-$(foreach deb,$(1), \
-	{ while true; do \
-		if mkdir $(DEBS_PATH)/dpkg_lock &> /dev/null; then \
-			{ sudo DEBIAN_FRONTEND=noninteractive dpkg -P $(firstword $(subst _, ,$(basename $(deb)))) $(LOG) && rm -d $(DEBS_PATH)/dpkg_lock && break; } || { rm -d $(DEBS_PATH)/dpkg_lock && exit 1 ; } \
-	    fi; \
-	done; } )
+if [ -n "$(1)" ]; then \
+    while true; do \
+        if mkdir $(DEBS_PATH)/dpkg_lock &> /dev/null; then \
+		    { sudo DEBIAN_FRONTEND=noninteractive dpkg -P $(foreach deb,$(1),$(firstword $(subst _, ,$(basename $(deb))))) $(LOG) && rm -d $(DEBS_PATH)/dpkg_lock && break; } || { rm -d $(DEBS_PATH)/dpkg_lock && exit 1 ; } \
+        fi; \
+    done; \
+fi
 endef
 
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