NVM: fixed bound check error in nvm_getDesc()

platform/drivers/NVM/nvmem_GDx.c

@@ -134,7 +134,7 @@ void nvm_terminate()
 
 const struct nvmDescriptor *nvm_getDesc(const size_t index)
 {
-    if(index > 2)
+    if(index >= ARRAY_SIZE(nvmDevices))
         return NULL;
 
     return &nvmDevices[index];

platform/drivers/NVM/nvmem_MDx.c

@@ -89,7 +89,7 @@ void nvm_terminate()
 
 const struct nvmDescriptor *nvm_getDesc(const size_t index)
 {
-    if(index > 3)
+    if(index >= ARRAY_SIZE(nvmDevices))
         return NULL;
 
     return &nvmDevices[index];

platform/drivers/NVM/nvmem_linux.c

@@ -152,7 +152,7 @@ void nvm_terminate()
 
 const struct nvmDescriptor *nvm_getDesc(const size_t index)
 {
-    if(index > 0)
+    if(index >= 0)
         return NULL;
 
     return &stateNvm;

platform/drivers/NVM/nvmem_ttwrplus.c

@@ -46,7 +46,7 @@ void nvm_terminate()
 
 const struct nvmDescriptor *nvm_getDesc(const size_t index)
 {
-    if(index > 0)
+    if(index >= 0)
         return NULL;
 
     return &nvMemory;