The formatting in t7900-subtree.sh isn't even consistent throughout the
file.  Fix that; make it consistent throughout the file.

Signed-off-by: Luke Shumaker <redacted>
---

diff --git a/contrib/subtree/t/t7900-subtree.sh b/contrib/subtree/t/t7900-subtree.sh

@@ -23,26 +21,24 @@ subtree_test_create_repo()
-check_equal()
-{
+check_equal () {
        test_debug 'echo'
        test_debug "echo \"check a:\" \"{$1}\""
        test_debug "echo \"      b:\" \"{$2}\""
-       if [ "$1" = "$2" ]; then
+       if [ "$1" = "$2" ]
+       then