am: handle --no-patch-format option

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 <redacted>
Signed-off-by: Junio C Hamano <redacted>

diff --git a/builtin/am.c b/builtin/am.c
index 3ee9a9d2a92aaa0e9716719640deaec7e260c811..dcb880b699a5c17311f0dbc083b9a3eda3a6b0fd 100644 (file)
--- 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;