[PATCH 2/2] rust: fix the default format for CONFIG_{RUSTC,BINDGEN}_VERSION_TEXT

[Masahiro Yamada <masahiroy@kernel.org>]

Another oddity in these config entries is their default value can fall
back to 'n', which is a value for bool or tristate symbols.

The '|| echo n' is an incorrect workaround to avoid the syntax error.
This is not a big deal, as the entry is hidden by 'depends on RUST' in
situations where '$(RUSTC) --version' or '$(BINDGEN) --version' fails.
Anyway, it looks odd.

The default of a string type symbol should be a double-quoted string
literal. Turn it into an empty string when the version command fails.

Fixes: 2f7ab1267dc9 ("Kbuild: add Rust support")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 init/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 466849f9f1b9..47e074a93d94 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1919,12 +1919,12 @@ config RUST
 config RUSTC_VERSION_TEXT
 	string
 	depends on RUST
-	default $(shell,$(RUSTC) --version 2>/dev/null || echo n)
+	default "$(shell,$(RUSTC) --version 2>/dev/null)"
 
 config BINDGEN_VERSION_TEXT
 	string
 	depends on RUST
-	default $(shell,$(BINDGEN) --version 2>/dev/null || echo n)
+	default "$(shell,$(BINDGEN) --version 2>/dev/null)"
 
 #
 # Place an empty function call at each tracepoint site. Can be
-- 
2.43.0