[hip][samples] fix a typo in module_api/defaultDriver sample (#1210)

[ROCm/hip commit: f21601733e]

projects/hip/samples/0_Intro/module_api/defaultDriver.cpp

@@ -68,7 +68,7 @@ int main() {
     for (uint32_t i = 0; i < LEN; i++) {
         if (A[i] != B[i]) {
             mismatchCount++;
-            std::cout << "error: mismatch " << A[i] << " != " << C[i] << std::endl;
+            std::cout << "error: mismatch " << A[i] << " != " << B[i] << std::endl;
         }
     }