util/kconfig: fix 0009-util-kconfig... patch

This was reverted via commit 9ab3a1fe4a and causes unapply to fail
so we adjust the patch to preserve the original return value.

Change-Id: I5ad2180854e0263d2d097b059cb16ec478b859c5
Signed-off-by: Richard Marko <srk@48.io>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78442
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/kconfig/patches/0009-util-kconfig-Allow-emitting-false-booleans-into-kconfig-output.patch

@@ -10,19 +10,6 @@ Date:   Fri Nov 22 22:08:15 2019 +0100
     Change-Id: I9e62b05e45709f1539e455e2eed37308609be15e
     Signed-off-by: Patrick Georgi <pgeorgi@google.com>
 
-Index: kconfig/symbol.c
-===================================================================
---- kconfig.orig/symbol.c
-+++ kconfig/symbol.c
-@@ -757,7 +757,7 @@ const char *sym_get_string_default(struc
- 		}
- 	case S_INT:
- 	case S_HEX:
--		return str;
-+		return "0";
- 	case S_STRING:
- 		return str;
- 	case S_UNKNOWN:
 Index: kconfig/confdata.c
 ===================================================================
 --- kconfig.orig/confdata.c