[PATCH] Avoid segfault when passed malformed refspec

A refspec typo can cause a Null-pointer dereference and segmentation
fault.  For instance, the space before the colon in the following
example results in a segfault:

   $ git fetch ../repo  refs/heads/* :refs/heads/*
   Segmentation fault (core dumped)

To avoid the segfault, set an empty refspec destination string
if one isn't found by parsing.

Signed-off-by: Sean Estabrooks <redacted>
---
 remote.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/remote.c b/remote.c
index 0e00680..414c73a 100644
--- a/remote.c
+++ b/remote.c

@@ -336,6 +336,8 @@ struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 			ep = gp;
 		}
 		rs[i].src = xstrndup(sp, ep - sp);
+		if (!rs[i].dst)
+			rs[i].dst = xstrdup("");
 	}
 	return rs;
 }

-- 
1.5.4.rc5.20.g4b806