This fixes a regression introduced in 22e612731b5 (submodule: port
submodule subcommand 'deinit' from shell to C, 2018-01-15), when handling
pathspecs that do not exist gracefully. This restores the historic behavior
of reporting the pathspec as unknown and returning instead of reporting a
bug.

Reported-by: Peter Oberndorfer <kumbay...@arcor.de>
Signed-off-by: Stefan Beller <sbel...@google.com>
---
 builtin/submodule--helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index ee020d4749..6ba8587b6d 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1042,7 +1042,7 @@ static int module_deinit(int argc, const char **argv, 
const char *prefix)
                die(_("Use '--all' if you really want to deinitialize all 
submodules"));
 
        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
-               BUG("module_list_compute should not choke on empty pathspec");
+               return 1;
 
        info.prefix = prefix;
        if (quiet)
-- 
2.17.0.rc1.321.gba9d0f2565-goog

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