When reporting the outcome of a push, a segfault occurs if HEAD does
not point somewhere.  Check that HEAD points somewhere before trying
to strcmp it.

Signed-off-by: Fraser Tweedale <fr...@frase.id.au>
---
 transport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/transport.c b/transport.c
index 9932f40..b9306ef 100644
--- a/transport.c
+++ b/transport.c
@@ -741,7 +741,7 @@ void transport_print_push_status(const char *dest, struct 
ref *refs,
                        n += print_one_push_status(ref, dest, n, porcelain);
                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD &&
                    *nonfastforward != NON_FF_HEAD) {
-                       if (!strcmp(head, ref->name))
+                       if (head != NULL && !strcmp(head, ref->name))
                                *nonfastforward = NON_FF_HEAD;
                        else
                                *nonfastforward = NON_FF_OTHER;
-- 
1.8.1.1

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