SWDEV-488316 - Fix memleaks in PrintfTests

Change-Id: I53e392ac41023a108874d5c58633b53f7b7b0007

catch/unit/printf/hipPrintfBasic.cc

@@ -218,6 +218,7 @@ TEST_CASE("Unit_Printf_PrintfBasicTsts") {
   test_divergent0(retval, num_blocks, threads_per_block);
   test_divergent1(retval, num_blocks, threads_per_block);
   test_series(retval, num_blocks, threads_per_block);
+  HIP_CHECK(hipFree(retval_void));
 }
 /**
 * End doxygen group PrintfTest.

catch/unit/printf/hipPrintfManyWaves.cc

@@ -272,6 +272,7 @@ TEST_CASE("Unit_Printf_PrintfManyWaves") {
   test_mixed2(retval, num_blocks, threads_per_block);
   test_mixed3(retval, num_blocks, threads_per_block);
   test_numbers(num_blocks, threads_per_block);
+  HIP_CHECK(hipFree(retval_void));
 }
 /**
 * End doxygen group PrintfTest.