[PATCHv2 05/20] diff.c: emit_line_0 can handle no color setting

[Stefan Beller]

In later patches we may pass lines that are not colored to the central
function emit_line_0, so we need to emit the color only when it is
non-NULL.

We could have chosen to pass "" instead of NULL, but that would be more
work.

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 diff.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/diff.c b/diff.c
index 73e55b0c10..6c1886d495 100644
--- a/diff.c
+++ b/diff.c
@@ -532,11 +532,13 @@ static void emit_line_0(struct diff_options *o, const 
char *set, const char *res
                len--;
 
        if (len || sign) {
-               fputs(set, file);
+               if (set)
+                       fputs(set, file);
                if (sign)
                        fputc(sign, file);
                fwrite(line, len, 1, file);
-               fputs(reset, file);
+               if (reset)
+                       fputs(reset, file);
        }
        if (has_trailing_carriage_return)
                fputc('\r', file);
-- 
2.13.0.18.g7d86cc8ba0