Fix Coverity issues in acl_program_test.cpp

A couple of function calls' return values where not being checked.

FIxes:
```
test/acl_program_test.cpp:133:3:
  Type: Unchecked return value (CHECKED_RETURN)

test/acl_program_test.cpp:133:3: Unchecked call to function
  1. check_return: Calling "acl_program_is_valid" without checking return value (as is done elsewhere 35 out of 36 times).
src/acl_kernel.cpp:2326:3: Examples where return value from this function is checked
  2. example_checked: Example 1: "acl_program_is_valid(kernel->program)" has its value checked in "acl_program_is_valid(kernel->program)".
src/acl_kernel.cpp:199:3: Examples where return value from this function is checked
  3. example_checked: Example 2: "acl_program_is_valid(program)" has its value checked in "acl_program_is_valid(program)".
src/acl_profiler.cpp:592:3: Examples where return value from this function is checked
  4. example_checked: Example 3: "acl_program_is_valid(program)" has its value checked in "acl_program_is_valid(program)".
src/acl_program.cpp:131:3: Examples where return value from this function is checked
  5. example_checked: Example 4: "acl_program_is_valid(program)" has its value checked in "acl_program_is_valid(program)".
src/acl_program.cpp:1463:3: Examples where return value from this function is checked
  6. example_checked: Example 5: "acl_program_is_valid(program)" has its value checked in "acl_program_is_valid(program)".

test/acl_program_test.cpp:132:3:
  Type: Unchecked return value (CHECKED_RETURN)

test/acl_program_test.cpp:132:3: Unchecked call to function
  1. check_return: Calling "acl_is_valid_ptr" without checking return value (as is done elsewhere 6 out of 7 times).
src/acl_program.cpp:1239:3: Examples where return value from this function is checked
  2. example_checked: Example 1: "acl_is_valid_ptr(program)" has its value checked in "acl_is_valid_ptr(program)".
test/acl_program_test.cpp:148:3: Examples where return value from this function is checked
  3. example_checked: Example 2: "acl_is_valid_ptr(cl_program const(NULL))" has its value checked in "acl_is_valid_ptr(cl_program const(NULL))".
test/acl_program_test.cpp:348:3: Examples where return value from this function is checked
  4. example_checked: Example 3: "acl_is_valid_ptr(program)" has its value checked in "acl_is_valid_ptr(program)".
test/acl_program_test.cpp:239:3: Examples where return value from this function is checked
  5. example_checked: Example 4: "acl_is_valid_ptr(program)" has its value checked in "acl_is_valid_ptr(program)".
test/acl_program_test.cpp:270:3: Examples where return value from this function is checked
  6. example_checked: Example 5: "acl_is_valid_ptr(cl_program const(&fake_program))" has its value checked in "acl_is_valid_ptr(cl_program const(&fake_program))".
```

Author: IlanTruanovsky

test/acl_program_test.cpp

@@ -129,8 +129,8 @@ MT_TEST_GROUP(acl_program) {
 MT_TEST(acl_program, link) {
   clRetainProgram(0);
   clReleaseProgram(0);
-  ACL_LOCKED(acl_is_valid_ptr<cl_program>(0));
-  ACL_LOCKED(acl_program_is_valid(0));
+  ACL_LOCKED(CHECK(0 == acl_is_valid_ptr<cl_program>(0)));
+  ACL_LOCKED(CHECK(0 == acl_program_is_valid(0)));
   CHECK_EQUAL(CL_SUCCESS, clUnloadCompiler());
   clCreateProgramWithSource(0, 0, 0, 0, 0);
   clCreateProgramWithBinary(0, 0, 0, 0, 0, 0, 0);