builtin-reflog.c: guard config parser from value=NULL

gc.reflogexpire and gc.reflogexpireunreachable configuration expect
 a string value suitable for calling approxidate() with.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-reflog.c b/builtin-reflog.c
index e6834dd..4836ec9 100644 (file)
--- a/builtin-reflog.c
+++ b/builtin-reflog.c
@@ -307,13 +307,19 @@ static int collect_reflog(const char *ref, const unsigned char *sha1, int unused
 
 static int reflog_expire_config(const char *var, const char *value)
 {
-       if (!strcmp(var, "gc.reflogexpire"))
+       if (!strcmp(var, "gc.reflogexpire")) {
+               if (!value)
+                       config_error_nonbool(var);
                default_reflog_expire = approxidate(value);
-       else if (!strcmp(var, "gc.reflogexpireunreachable"))
+               return 0;
+       }
+       if (!strcmp(var, "gc.reflogexpireunreachable")) {
+               if (!value)
+                       config_error_nonbool(var);
                default_reflog_expire_unreachable = approxidate(value);
-       else
-               return git_default_config(var, value);
-       return 0;
+               return 0;
+       }
+       return git_default_config(var, value);
 }
 
 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)