d3dx8: Fix the condition in D3DXMatrixIsIdentity.

dlls/d3dx8/tests/math.c

@@ -140,6 +140,10 @@ static void D3DXMatrixTest(void)
     expected = TRUE;
     got = D3DXMatrixIsIdentity(&mat);
     ok(expected == got, "Expected : %d, Got : %d\n", expected, got);
+    U(mat).m[0][0] = 0.000009f;
+    expected = FALSE;
+    got = D3DXMatrixIsIdentity(&mat);
+    ok(expected == got, "Expected : %d, Got : %d\n", expected, got);
     /* Test the NULL case */
     expected = FALSE;
     got = D3DXMatrixIsIdentity(NULL);

include/d3dx8math.inl

@@ -351,7 +351,6 @@ static inline BOOL D3DXMatrixIsIdentity(D3DXMATRIX *pm)
 {
     int i,j;
     D3DXMATRIX testmatrix;
-    BOOL equal=TRUE;
 
     if ( !pm ) return FALSE;
     D3DXMatrixIdentity(&testmatrix);
@@ -359,10 +358,10 @@ static inline BOOL D3DXMatrixIsIdentity(D3DXMATRIX *pm)
     {
      for (j=0; j<4; j++)
      {
-      if ( fabs(D3DX_U(*pm).m[i][j] - D3DX_U(testmatrix).m[i][j]) > 0.0001 ) equal = FALSE;
+      if ( D3DX_U(*pm).m[i][j] != D3DX_U(testmatrix).m[i][j] ) return FALSE;
      }
     }
-    return equal;
+    return TRUE;
 }
 #undef D3DX_U