init/Kconfig: Use short unix-style option instead of --longname

Avoids warning messages with the latest release of toybox, which never
bothered to implement the --longopts nothing was using.
Signed-off-by: NRob Landley <rob@landley.net>
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

init/Kconfig

@@ -2,9 +2,9 @@ config DEFCONFIG_LIST
 	string
 	depends on !UML
 	option defconfig_list
-	default "/lib/modules/$(shell,uname --release)/.config"
+	default "/lib/modules/$(shell,uname -r)/.config"
 	default "/etc/kernel-config"
-	default "/boot/config-$(shell,uname --release)"
+	default "/boot/config-$(shell,uname -r)"
 	default ARCH_DEFCONFIG
 	default "arch/$(ARCH)/defconfig"