gifn: shellcheck: read -r

Change-Id: If9205e05827afd10db4bdc860f30f4d532ffdc22
diff --git a/tools/git-if-needed/sh/git-if-needed b/tools/git-if-needed/sh/git-if-needed
index c0f4fbc..9d79cf4 100755
--- a/tools/git-if-needed/sh/git-if-needed
+++ b/tools/git-if-needed/sh/git-if-needed
@@ -52,7 +52,7 @@
 	series_dir="$(dirname -- "$series")"
 	curdir="$(readlink -f .)"
 
-	while read filename; do
+	while read -r filename; do
 		dirname="$(dirname -- "$filename")"
 		if [ -n "$short" ]; then
 			dirname="$(basename -- "$dirname")"