fix: warning: 'port_start' may be used uninitialized in this function

Signed-off-by: Oleg Kokorin <[email protected]>

Author: Ole2mail

connectivity/drivers/cellular/GEMALTO/CINTERION/GEMALTO_CINTERION_CellularStack.cpp

@@ -444,7 +444,7 @@ nsapi_size_or_error_t GEMALTO_CINTERION_CellularStack::socket_recvfrom_impl(Cell
         if (address) {
             char *ip_start = ip_address;
             char *ip_stop;
-            char *port_start;
+            char *port_start = (char *)0xDEADBEEF;
             if (_stack_type == IPV6_STACK) {
                 ip_start++; // skip '['
                 ip_stop = strchr(ip_address, ']');