kbuild: Create INSTALL_PATH directory if it does not exist

If INSTALL_PATH is not a valid directory, create it, like what
modules_install and dtbs_install will do in the same situation.

Signed-off-by: Zhang Bingwu <xtexchooser@duck.com>
Reviewed-by: Nicolas Schier <nicolas@jasle.eu>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff --git a/scripts/install.sh b/scripts/install.sh
index 9bb0fb4..05d62ac 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -20,6 +20,10 @@
 	fi
 done
 
+if [ -n "${INSTALL_PATH}" ] && ! [ -e "${INSTALL_PATH}" ]; then
+	mkdir -p "${INSTALL_PATH}"
+fi
+
 # User/arch may have a custom install script
 for file in "${HOME}/bin/${INSTALLKERNEL}"		\
 	    "/sbin/${INSTALLKERNEL}"			\