Taken from upstream:
https://git.kernel.org/pub/scm/utils/dtc/dtc.git/commit/?id=32174a66efa4ad19fc6a2a6422e4af2ae4f055cb

From 32174a66efa4ad19fc6a2a6422e4af2ae4f055cb Mon Sep 17 00:00:00 2001
From: David Gibson <david@gibson.dropbear.id.au>
Date: Tue, 28 Feb 2023 10:33:58 +1100
Subject: [PATCH] meson: Fix cell overflow tests when running from meson

Because meson always builds out-of-tree we need to reference things in the
original source tree via $SRCDIR from run_tests.sh.  We forgot a couple of
cases for the cell overflow tests.  Fix them.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 tests/run_tests.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 91350ad3..f899d8cb 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -519,8 +519,8 @@ libfdt_tests () {
     check_tests "$SRCDIR/phandle-args-overflow.dts" clocks_property
 
     ## https://github.com/dgibson/dtc/issues/74
-    run_dtc_test -I dts -O dtb -o cell-overflow-results.test.dtb cell-overflow-results.dts
-    run_dtc_test -I dts -O dtb -o cell-overflow.test.dtb cell-overflow.dts
+    run_dtc_test -I dts -O dtb -o cell-overflow-results.test.dtb "$SRCDIR/cell-overflow-results.dts"
+    run_dtc_test -I dts -O dtb -o cell-overflow.test.dtb "$SRCDIR/cell-overflow.dts"
     run_test dtbs_equal_ordered cell-overflow.test.dtb cell-overflow-results.test.dtb
 
     # check full tests