grep: use REG_STARTEND for all matching if available

diff --git a/color.c b/color.c
index e8bcac0a79a27ee093f3d5a92013780cf52eb9da..bcf4e2c192c31136729aabcc2575a94f809d2980 100644 (file)
--- a/color.c
+++ b/color.c
@@ -146,6 +146,9 @@ int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
                        goto auto_color;
        }
 
+       if (!var)
+               return -1;
+
        /* Missing or explicit false to turn off colorization */
        if (!git_config_bool(var, value))
                return 0;