kbuild: trivial - use tabs for code indent where possible

Imported from upstream linux kernel kconfig.

Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

Change-Id: Ieed948c6b9c5fc40c1f3d652df11fa70ec6e93a0
Original-Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Original-Signed-off-by: Michal Marek <mmarek@suse.cz>
Reviewed-on: http://review.coreboot.org/9308
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
diff --git a/util/kconfig/lxdialog/util.c b/util/kconfig/lxdialog/util.c
index 58a8289..f7abdeb 100644
--- a/util/kconfig/lxdialog/util.c
+++ b/util/kconfig/lxdialog/util.c
@@ -623,7 +623,7 @@
 void item_add_str(const char *fmt, ...)
 {
 	va_list ap;
-        size_t avail;
+	size_t avail;
 
 	avail = sizeof(item_cur->node.str) - strlen(item_cur->node.str);