buildsystem: clean up and cosmetics

scripts/unpack

@@ -25,15 +25,15 @@ if [ -z "$1" ]; then
   exit 1
 fi
 
-$SCRIPTS/get $1
-
-STAMP=$PKG_BUILD/.openelec-unpack
-
 if [ ! -f $PKG_DIR/package.mk ]; then
   printf "${boldred} no package.mk file found in $PKG_DIR${endcolor}\n"
   exit 1
 fi
 
+$SCRIPTS/get $1
+
+STAMP=$PKG_BUILD/.openelec-unpack
+
 mkdir -p $BUILD
 
 [ ! -d "$SOURCES/$1" -a ! -d "$PKG_DIR/sources" ] && exit 0