Merge pull request #12427 from DavidLin1577/patch-1

Minor optimisation to  mcr20a-rf-driver code

Author: 0xc0170

components/802.15.4_RF/mcr20a-rf-driver/source/MCR20Drv.c

@@ -45,6 +45,7 @@
 #if defined(MBED_CONF_NANOSTACK_CONFIGURATION) && DEVICE_SPI && DEVICE_INTERRUPTIN && defined(MBED_CONF_RTOS_PRESENT)
 
 #include "platform/mbed_critical.h"
+#include <string.h>
 
 /*****************************************************************************
 *                               PRIVATE VARIABLES                           *
@@ -165,7 +166,7 @@ void MCR20Drv_DirectAccessSPIMultiByteWrite
 {
     uint8_t txData;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return;
     }
 
@@ -230,7 +231,7 @@ void MCR20Drv_PB_SPIBurstWrite
 {
     uint8_t txData;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return;
     }
 
@@ -301,7 +302,7 @@ uint8_t MCR20Drv_DirectAccessSPIMultiByteRead
     uint8_t  txData;
     uint8_t  phyIRQSTS1;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return 0;
     }
 
@@ -338,7 +339,7 @@ uint8_t MCR20Drv_PB_SPIBurstRead
     uint8_t  txData;
     uint8_t  phyIRQSTS1;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return 0;
     }
 
@@ -406,7 +407,7 @@ void MCR20Drv_IndirectAccessSPIMultiByteWrite
 {
     uint16_t  txData;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return;
     }
 
@@ -473,7 +474,7 @@ void MCR20Drv_IndirectAccessSPIMultiByteRead
 {
     uint16_t  txData;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return;
     }