t3419-*.sh: Fix arithmetic expansion syntax error

diff --git a/git-am.sh b/git-am.sh
index 6184101c2b0a6c4661210b6615b1ffcc1d1c2215..de116a29ef091a23f60603a28f1260ba60f054ac 100755 (executable)
--- a/git-am.sh
+++ b/git-am.sh
@@ -137,7 +137,7 @@ It does not apply to blobs recorded in its index."
     export GITHEAD_$his_tree
     if test -n "$GIT_QUIET"
     then
-           export GIT_MERGE_VERBOSITY=0
+           GIT_MERGE_VERBOSITY=0 && export GIT_MERGE_VERBOSITY
     fi
     git-merge-recursive $orig_tree -- HEAD $his_tree || {
            git rerere $allow_rerere_autoupdate