screen: Fix typo.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

utils/screen/Makefile

@@ -9,13 +9,13 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=screen
 PKG_VERSION:=4.2.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@GNU/screen
 PKG_MD5SUM:=419a0594e2b25039239af8b90eda7d92
 
-PKG_LICENSE:GPL-3.0+
+PKG_LICENSE:=GPL-3.0+
 PKG_LICENSE_FILES:=
 
 include $(INCLUDE_DIR)/package.mk