selftests/powerpc/pmu: Fix sample field check in the mmcra_thresh_marked_sample_test

The testcase verifies the setting of different fields in Monitor Mode
Control Register A (MMCRA). In the current code, EV_CODE_EXTRACT macro
is used to extract the "sample" field, which then needs to be further
processed to fetch rand_samp_elig and rand_samp_mode bits. But the
current code is not passing valid sample field to EV_CODE_EXTRACT
macro. Patch addresses this by fixing the input for EV_CODE_EXTRACT.

Fixes: 29cf373c5766 ("selftests/powerpc/pmu: Add interface test for mmcra register fields")
Reported-by: David Binderman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Kajol Jain <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://msgid.link/[e-mail]

tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_marked_sample_test.c

···
 			get_mmcra_thd_stop(get_reg_value(intr_regs, "MMCRA"), 4));
 	FAIL_IF(EV_CODE_EXTRACT(event.attr.config, marked) !=
 			get_mmcra_marked(get_reg_value(intr_regs, "MMCRA"), 4));
-	FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sample >> 2) !=
+	FAIL_IF((EV_CODE_EXTRACT(event.attr.config, sample) >> 2) !=
 			get_mmcra_rand_samp_elig(get_reg_value(intr_regs, "MMCRA"), 4));
-	FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sample & 0x3) !=
+	FAIL_IF((EV_CODE_EXTRACT(event.attr.config, sample) & 0x3) !=
 			get_mmcra_sample_mode(get_reg_value(intr_regs, "MMCRA"), 4));
 	FAIL_IF(EV_CODE_EXTRACT(event.attr.config, sm) !=
 			get_mmcra_sm(get_reg_value(intr_regs, "MMCRA"), 4));