submodule summary: do not shift a non-existent positional variable

When "git submodule summary" is run without any argument, we default to
compare the state of index with the HEAD, but tried to shift out $1 that
does not exist (and worse yet, we didn't use it).

Signed-off-by: Junio C Hamano <redacted>

diff --git a/git-submodule.sh b/git-submodule.sh
index 5869c00f2d5db4d8316002267a8605096357d5ed..383dc451191fef4e078e9f46aaf3fdb3190ebc9a 100755 (executable)
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -556,7 +556,7 @@ cmd_summary() {
        if rev=$(git rev-parse -q --verify --default HEAD ${1+"$1"})
        then
                head=$rev
-               shift
+               test $# = 0 || shift
        elif test -z "$1" -o "$1" = "HEAD"
        then
                return