[dtests] Added few Negative tests (#1735)

src/hip_memory.cpp

@@ -2271,8 +2271,6 @@ hipError_t hipMemGetInfo(size_t* free, size_t* total) {
         auto device = ctx->getWriteableDevice();
         if (total) {
             *total = device->_props.totalGlobalMem;
-        } else {
-            e = hipErrorInvalidValue;
         }
 
         if (free) {
@@ -2295,8 +2293,6 @@ hipError_t hipMemGetInfo(size_t* free, size_t* total) {
 		} else {
  		    return ihipLogStatus(hipErrorInvalidValue);
 		}
-        } else {
-            e = hipErrorInvalidValue;
         }
 
     } else {