Fix FTBFS with clang

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 191490e34508041a8bfab9535f7e65ee2c71b695)

1 files changed, 6 insertions, 2 deletions

diff --git a/kstars/kstars/fitsviewer.cpp b/kstars/kstars/fitsviewer.cpp
index a5e6143c..135c5cad 100644
--- a/kstars/kstars/fitsviewer.cpp
+++ b/kstars/kstars/fitsviewer.cpp
@@ -334,9 +334,13 @@ float * FITSViewer::loadData(const char *filename, float *buffer)
    case 32:
    for (int i=0; i < totalCount ; i++)
     {
-    FITS_GETBITPIX32(tempData, pixval_32);
     //pixval_32 = ntohl(pixval_32);
-    if (isnan(pixval_32)) pixval_32 = 0;
+    if (fits_nan_32(tempData)) {
+        pixval_32 = 0;
+    }
+    else {
+        FITS_GETBITPIX32(tempData, pixval_32);
+    }
     buffer[i] = pixval_32;
     tempData+=4;
    }