builtin-commit.c: fix logic to omit empty line before existing footers

diff --git a/builtin-commit.c b/builtin-commit.c
index c395cbf14f7e99880f39a63939dc174ba494004c..cfa6b06e92924484376d853eef7171d163fe7fe1 100644 (file)
--- a/builtin-commit.c
+++ b/builtin-commit.c
@@ -530,7 +530,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
                        ; /* do nothing */
                if (prefixcmp(sb.buf + i, sob.buf)) {
-                       if (!ends_rfc2822_footer(&sb))
+                       if (!i || !ends_rfc2822_footer(&sb))
                                strbuf_addch(&sb, '\n');
                        strbuf_addbuf(&sb, &sob);
                }