write_redis: pass a literal string to snprintf()

This corrects the following compiler warning when building with
"-Werror=format-security" (the default when building debian packages):

write_redis.c:91:3: error: format not a string literal and no format
arguments

diff --git a/src/write_redis.c b/src/write_redis.c
index b47650d..b4c5e21 100644 (file)
--- a/src/write_redis.c
+++ b/src/write_redis.c
@@ -88,8 +88,7 @@ static int wr_write (const data_set_t *ds, /* {{{ */
   }                                                                  \
 } while (0)
 
-  APPEND (time);
-  APPEND (":");
+  APPEND ("%s:", time);
 
   for (i = 0; i < ds->ds_num; i++)
   {