Fix transport recv return value (CA-343)

[chinglee-iot]

In this PR:

• Transport interface recv function returns 0 should represent the read operation can be retried. Negative value should be returned when input parameters and recv bytes are invalid. Reference this document.

Test Run the transport interface test the following test cases should has no error.

TEST(Full_TransportInterfaceTest, TransportRecv_NetworkContextNullPtr)./components/FreeRTOS-Libraries-Integration-Tests/FreeRTOS-Libraries-Integration-Tests/src/transport_interface/transport_interface_test.c:865::FAIL: Expected 0 to be less than 0. Transport interface recv with NULL network context pointer should return negative value.

TEST(Full_TransportInterfaceTest, TransportRecv_BufferNullPtr)./components/FreeRTOS-Libraries-Integration-Tests/FreeRTOS-Libraries-Integration-Tests/src/transport_interface/transport_interface_test.c:886::FAIL: Expected 0 to be less than 0. Transport interface recv with NULL buffer pointer should return negative value.

TEST(Full_TransportInterfaceTest, TransportRecv_ZeroByteToRecv)./components/FreeRTOS-Libraries-Integration-Tests/FreeRTOS-Libraries-Integration-Tests/src/transport_interface/transport_interface_test.c:905::FAIL: Expected 0 to be less than 0. Transport interface recv with zero byte to recv should return negative value.

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