Switch uses of os.Getenv that check for empty string to os.LookupEnv.

Whether the variable was found is already returned by syscall.Getenv.
os.Getenv drops this value while os.Lookupenv passes it along.

PiperOrigin-RevId: 351674032

1 files changed, 3 insertions, 4 deletions

diff --git a/runsc/cmd/gofer_test.go b/runsc/cmd/gofer_test.go
index cbea7f127..fea62a4f4 100644
--- a/runsc/cmd/gofer_test.go
+++ b/runsc/cmd/gofer_test.go
@@ -24,11 +24,10 @@ import (
 )
 
 func tmpDir() string {
-	dir := os.Getenv("TEST_TMPDIR")
-	if dir == "" {
-		dir = "/tmp"
+	if dir, ok := os.LookupEnv("TEST_TMPDIR"); ok {
+		return dir
 	}
-	return dir
+	return "/tmp"
 }
 
 type dir struct {