scripts/tags.sh: fix the Kconfig tags generation when using latest ctags

The Kconfig language has already been built-in in the latest ctags, so it
would error exit if we try to define it as an user-defined language via
'--langdef=kconfig'.  This results that there is no Kconfig tags in the
final tag file.  Fix this by skipping the user Kconfig definition for the
latest ctags.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Kevin Hao <[email protected]>
Reviewed-by: Cristian Ciocaltea <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Nicolas Schier <[email protected]>
Cc: Paulo Miguel Almeida <[email protected]>
Cc: Vipin Sharma <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: haokexin

scripts/tags.sh

@@ -264,10 +264,12 @@ exuberant()
 	--$CTAGS_EXTRA=+fq --c-kinds=+px --fields=+iaS --langmap=c:+.h \
 	"${regex[@]}"
 
-	setup_regex exuberant kconfig
-	all_kconfigs | xargs $1 -a                              \
-	--langdef=kconfig --language-force=kconfig "${regex[@]}"
-
+	KCONFIG_ARGS=()
+	if ! $1 --list-languages | grep -iq kconfig; then
+		setup_regex exuberant kconfig
+		KCONFIG_ARGS=(--langdef=kconfig --language-force=kconfig "${regex[@]}")
+	fi
+	all_kconfigs | xargs $1 -a "${KCONFIG_ARGS[@]}"
 }
 
 emacs()