build: fix build error

07295692 · Alexander Alekhin · 944d40a1 · 07295692
Commit 07295692 authored Jan 25, 2017 by Alexander Alekhin
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affine_feature2d.cpp modules/xfeatures2d/src/affine_feature2d.cpp +1 -1

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--- a/modules/xfeatures2d/src/affine_feature2d.cpp
+++ b/modules/xfeatures2d/src/affine_feature2d.cpp
@@ -211,7 +211,7 @@ bool calcAffineAdaptation(const Mat & fimage, Elliptic_KeyPoint & keypoint)
            float ratio = 1 - q;

            //if ratio == 1 means q == 0 and one axes equals to 0
-            if (!isnan(ratio) && ratio != 1)
+            if (!cvIsNaN(ratio) && ratio != 1)
            {
                //Update U matrix
                U = U * Mk;