kconfig: remove unneeded symbol_empty variable

This is used only for initializing other variables.

Use the empty string "" directly.

Please note newval.tri is unused for S_INT/HEX/STRING.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2023-11-26 01:35:58 +09:00
commit 4e244c10ea