tree: bump PKG_RELEASE

It was missing in a previous change bab8741 (tree: use
TARGET_{CFLAGS,LDFLAGS} instead of the package default)

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

utils/tree/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=tree
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_VERSION:=1.7.0
 PKG_SOURCE_URL:=ftp://mama.indstate.edu/linux/tree/
 PKG_HASH:=6957c20e82561ac4231638996e74f4cfa4e6faabc5a2f511f0b4e3940e8f7b12