src/utils_db_query.c: Correctly handle return value of strjoin().

It returns the number of bytes, not zero, on success. This fixes a
bug introduced in 496ca2b758344bc6372ab0adf98ad8050f69b25a.

diff --git a/src/utils_db_query.c b/src/utils_db_query.c
index 9a16873..5fbdfd1 100644 (file)
--- a/src/utils_db_query.c
+++ b/src/utils_db_query.c
@@ -238,7 +238,7 @@ static int udb_result_submit (udb_result_t *r, /* {{{ */
     {
       int status = strjoin (vl.type_instance, sizeof (vl.type_instance),
           r_area->instances_buffer, r->instances_num, "-");
-      if (status != 0)
+      if (status < 0)
       {
         ERROR ("udb_result_submit: creating type_instance failed with status %d.",
             status);
@@ -251,7 +251,7 @@ static int udb_result_submit (udb_result_t *r, /* {{{ */
 
       int status = strjoin (tmp, sizeof (tmp), r_area->instances_buffer,
           r->instances_num, "-");
-      if (status != 0)
+      if (status < 0)
       {
         ERROR ("udb_result_submit: creating type_instance failed with status %d.",
             status);