Fix signed/unsigned warnings for SCTP_EVENTS workaround

src/SCTPasp_PT.cc

@@ -72,17 +72,17 @@
 
 namespace SCTPasp__PortType {
 
-/* is any of the bytes from offset .. u8_size in 'u8' non-zero? return offset or -1 if all zero */
-static int byte_nonzero(const uint8_t *u8, unsigned int offset, unsigned int u8_size)
+/* is any of the bytes from offset .. u8_size in 'u8' non-zero? return offset or u8_size if all zero */
+static unsigned int byte_nonzero(const uint8_t *u8, unsigned int offset, unsigned int u8_size)
 {
-  int j;
+  unsigned int j;
   for (j = offset; j < u8_size; j++) {
     if (u8[j] != 0)
-      return j;
+      break;
   }
-  return -1;
+  return j;
 }
-static int sctp_sockopt_event_subscribe_size = 0;
+static unsigned int sctp_sockopt_event_subscribe_size = 0;
 static int determine_sctp_sockopt_event_subscribe_size(void)
 {
   uint8_t buf[256];
@@ -118,7 +118,7 @@ static int determine_sctp_sockopt_event_subscribe_size(void)
 static int sctp_setsockopt_events_linux_workaround(int fd, const struct sctp_event_subscribe *event)
 {
   const unsigned int compiletime_size = sizeof(*event);
-  int rc;
+  unsigned int rc;
   if (determine_sctp_sockopt_event_subscribe_size() < 0) {
     TTCN_warning("Cannot determine SCTP_EVENTS socket option size");
     return -1;
@@ -139,7 +139,7 @@ static int sctp_setsockopt_events_linux_workaround(int fd, const struct sctp_eve
      * truncated portion */
     rc = byte_nonzero((const uint8_t *)event, sctp_sockopt_event_subscribe_size,
           compiletime_size);
-    if (rc >= 0) {
+    if (rc != compiletime_size) {
       TTCN_warning("Kernel only supports sctp_event_subscribe of %u bytes, "
         "but caller tried to enable more modern event at offset %u",
         sctp_sockopt_event_subscribe_size, rc);