Running "git am --no-patch-format" will currently segfault, since it
tries to parse a NULL argument. Instead, let's have it cancel any
previous --patch-format option.

Signed-off-by: Jeff King <[email protected]>
---
 builtin/am.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index 3ee9a9d2a9..dcb880b699 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2165,7 +2165,9 @@ static int parse_opt_patchformat(const struct option 
*opt, const char *arg, int
 {
        int *opt_value = opt->value;
 
-       if (!strcmp(arg, "mbox"))
+       if (unset)
+               *opt_value = PATCH_FORMAT_UNKNOWN;
+       else if (!strcmp(arg, "mbox"))
                *opt_value = PATCH_FORMAT_MBOX;
        else if (!strcmp(arg, "stgit"))
                *opt_value = PATCH_FORMAT_STGIT;
-- 
2.19.1.1505.g9cd28186cf

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