[RFC PATCH] scripts/checkpatch: fix uninitialised value check

["Alex Bennée" <alex.bennee@linaro.org>]

This was starting to show up in the check-patch test on gitlab.

Fixes: d2f1af0e41 ("checkpatch: don't emit warning on newly created acpi data files")
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Isaku Yamahata <isaku.yamahata@intel.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
---
 scripts/checkpatch.pl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 8f7053ec9b..3d185cceac 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1532,6 +1532,7 @@ sub process {
 		     ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
 		      (defined($1) || defined($2)))) &&
                       !(($realfile ne '') &&
+                        defined($acpi_testexpected) &&
                         ($realfile eq $acpi_testexpected))) {
 			$reported_maintainer_file = 1;
 			WARN("added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
-- 
2.20.1