selftests:kvm: fix get_trans_hugepagesz() ignoring fscanf() return warn

Fix get_trans_hugepagesz() to check fscanf() return value to get rid
of the following warning:

lib/test_util.c: In function ‘get_trans_hugepagesz’:
lib/test_util.c:138:2: warning: ignoring return value of ‘fscanf’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  138 |  fscanf(f, "%ld", &size);
      |  ^~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
index af1031f..938cd42 100644 (file)
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -129,13 +129,16 @@ size_t get_trans_hugepagesz(void)
 {
        size_t size;
        FILE *f;
+       int ret;
 
        TEST_ASSERT(thp_configured(), "THP is not configured in host kernel");
 
        f = fopen("/sys/kernel/mm/transparent_hugepage/hpage_pmd_size", "r");
        TEST_ASSERT(f != NULL, "Error in opening transparent_hugepage/hpage_pmd_size");
 
-       fscanf(f, "%ld", &size);
+       ret = fscanf(f, "%ld", &size);
+       ret = fscanf(f, "%ld", &size);
+       TEST_ASSERT(ret < 1, "Error reading transparent_hugepage/hpage_pmd_size");
        fclose(f);
 
        return size;