Avoid chown on PID and PGID files in debug mode

In debug mode, these files are not created in debug mode (as daemonize() is not triggered), so any chown() will simply fail on it.

(cherry picked from commit 15a0ea7)

daemonize.c

@@ -391,24 +391,28 @@ int daemonize(char* name, int * own_pgid)
  */
 int do_suid(const int uid, const int gid)
 {
-	if (pid_file) {
-		/* pid file should be already created by deamonize function
-		   -> change the owner and group also
-		*/
-		if (chown( pid_file , uid?uid:-1, gid?gid:-1)!=0) {
-			LM_ERR("failed to change owner of pid file %s: %s(%d)\n",
-				pid_file, strerror(errno), errno);
-			goto error;
+	/* if running in debug mode, do not do anything about the PID file
+	 * as they are not created (daemonize() is not used in debug mode) */
+	if (!debug_mode) {
+		if (pid_file) {
+			/* pid file should be already created by deamonize function
+			   -> change the owner and group also
+			*/
+			if (chown( pid_file , uid?uid:-1, gid?gid:-1)!=0) {
+				LM_ERR("failed to change owner of pid file %s: %s(%d)\n",
+					pid_file, strerror(errno), errno);
+				goto error;
+			}
 		}
-	}
-	if (pgid_file) {
-		/* pgid file should be already created by deamonize function
-		   -> change the owner and group also
-		*/
-		if (chown( pgid_file , uid?uid:-1, gid?gid:-1)!=0) {
-			LM_ERR("failed to change owner of pid file %s: %s(%d)\n",
-				pgid_file, strerror(errno), errno);
-			goto error;
+		if (pgid_file) {
+			/* pgid file should be already created by deamonize function
+			   -> change the owner and group also
+			*/
+			if (chown( pgid_file , uid?uid:-1, gid?gid:-1)!=0) {
+				LM_ERR("failed to change owner of pid file %s: %s(%d)\n",
+					pgid_file, strerror(errno), errno);
+				goto error;
+			}
 		}
 	}