build: fix typo in error message

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Fixes: f62bbee55d503f639ee9498878ebf42ff4f4299a
diff --git a/scripts/git-submodule.sh b/scripts/git-submodule.sh
index bc7224a..807ca0b 100755
--- a/scripts/git-submodule.sh
+++ b/scripts/git-submodule.sh
@@ -28,7 +28,7 @@
     echo
     echo "and then manually update submodules prior to running make, with:"
     echo
-    echo " $ scripts/git-sbumodule.sh update $modules"
+    echo " $ scripts/git-submodule.sh update $modules"
     echo
     exit 1
 }