bup-save-user: Fix shellcheck(1) warning

diff --git a/bup/save-user/bup-save-user b/bup/save-user/bup-save-user
index c60f06a410e8175929eb084ee1740ca12c4a5aed..cf473ccaebe1798de7dd73f2777d51242a2de17c 100755 (executable)
--- a/bup/save-user/bup-save-user
+++ b/bup/save-user/bup-save-user
@@ -9,7 +9,7 @@
 # (at your option) any later version.
 #
 
-NAME=`basename "$0"`
+NAME=$(basename "$0")
 
 Usage()
 {