kfdtest: Correct mmap return value checking

On error mmap returns value MAP_FAILED, which is (void *)-1, not NULL
pointer.

Change-Id: I81b187266c943fa0aa4fab21b529d4c2989b12ad
Signed-off-by: Philip Yang <Philip.Yang@amd.com>


[ROCm/ROCR-Runtime commit: 590fd531c0]

projects/rocr-runtime/tests/kfdtest/src/KFDTestUtil.cpp

@@ -862,7 +862,7 @@ HsaSVMRange::HsaSVMRange(void *addr, HSAuint64 size, HSAuint32 GPUNode, HSAuint3
     m_SelfAllocated(false) {
     if (!m_pUser) {
         m_pUser = mmap(0, m_Size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
-        EXPECT_NOTNULL(m_pUser);
+        EXPECT_NE(MAP_FAILED, m_pUser);
         m_SelfAllocated = true;
     }