Fixed ESP8266 nullpointer dereference.

Author: tymoteuszblochmobica

components/wifi/esp8266-driver/ESP8266/ESP8266.cpp

@@ -557,6 +557,9 @@ nsapi_error_t ESP8266::open_tcp(int id, const char *addr, int port, int keepaliv
     static const char *type = "TCP";
     bool done = false;
 
+    if (!addr) {
+        return NSAPI_ERROR_PARAMETER;
+    }
     _smutex.lock();
 
     // process OOB so that _sock_i reflects the correct state of the socket

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/device/TOOLCHAIN_IAR/LPC55S69_cm33_core0_flash.icf

@@ -59,7 +59,7 @@ if (!isdefinedsymbol(MBED_BOOT_STACK_SIZE)) {
 }
 
 define symbol __stack_size__ = MBED_BOOT_STACK_SIZE;
-define symbol __heap_size__  = 0x4000;
+define symbol __heap_size__  = 0x04000;
 
 define symbol __ram_vector_table_size__   =  isdefinedsymbol(__ram_vector_table__) ? 0x00000200 : 0;
 define symbol __ram_vector_table_offset__ =  isdefinedsymbol(__ram_vector_table__) ? 0x000001FF : 0;