mxqd: Remove surplus \n from log messages

mxqd.c

@@ -1833,7 +1833,7 @@ static void kill_cancelled_jobs(struct ppidcache *ppidcache, struct mxq_server *
             " AND server_id = ?"
     );
     if (!stmt) {
-        mx_log_err("mx_mysql_stmt_prepare: %s\n", mx_mysql_error());
+        mx_log_err("mx_mysql_stmt_prepare: %s", mx_mysql_error());
         return;
     }
 
@@ -1843,7 +1843,7 @@ static void kill_cancelled_jobs(struct ppidcache *ppidcache, struct mxq_server *
     unsigned long long num_rows;
     int res = mx_mysql_statement_execute(stmt, &num_rows);
     if (res < 0) {
-        mx_log_err("mx_mysql_statement_execute: %s\n", mx_mysql_error());
+        mx_log_err("mx_mysql_statement_execute: %s", mx_mysql_error());
         return;
     }
     if (num_rows == 0)
@@ -1855,7 +1855,7 @@ static void kill_cancelled_jobs(struct ppidcache *ppidcache, struct mxq_server *
     for (unsigned long i = 0 ; i < num_rows ; i++) {
         res = mx_mysql_statement_fetch(stmt);
         if (res < 0) {
-            mx_log_err("mx_mysql_statement_fetch: %s\n", mx_mysql_error());
+            mx_log_err("mx_mysql_statement_fetch: %s", mx_mysql_error());
             return;
         }
         mx_log_debug("kill running job id %lu", job_id);