[PATCH v2 1/2] bugreport.c: fix a crash in `git bugreport` with `--no-suffix` option

["Jiamu Sun via GitGitGadget" <gitgitgadget@gmail.com>]

From: Jiamu Sun <barroit@linux.com>

executing `git bugreport --no-suffix` led to a segmentation fault
due to strbuf_addftime() being called with a NULL option_suffix
variable. This occurs because negating the "--[no-]suffix" option
causes the parser to set option_suffix to NULL, which is not
handled prior to calling strbuf_addftime().

Signed-off-by: Jiamu Sun <barroit@linux.com>
---
 builtin/bugreport.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/builtin/bugreport.c b/builtin/bugreport.c
index 3106e56a130..32281815b77 100644
--- a/builtin/bugreport.c
+++ b/builtin/bugreport.c
@@ -138,8 +138,11 @@ int cmd_bugreport(int argc, const char **argv, const char *prefix)
 	strbuf_complete(&report_path, '/');
 	output_path_len = report_path.len;
 
-	strbuf_addstr(&report_path, "git-bugreport-");
-	strbuf_addftime(&report_path, option_suffix, localtime_r(&now, &tm), 0, 0);
+	strbuf_addstr(&report_path, "git-bugreport");
+	if (option_suffix) {
+		strbuf_addch(&report_path, '-');
+		strbuf_addftime(&report_path, option_suffix, localtime_r(&now, &tm), 0, 0);
+	}
 	strbuf_addstr(&report_path, ".txt");
 
 	switch (safe_create_leading_directories(report_path.buf)) {
-- 
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