fix handling of INF or NAN

Author: martin-frbg

kernel/arm/scal.c

@@ -48,7 +48,11 @@ int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da, FLOAT *x, BLAS
 	{
 
 		if ( da == 0.0 )
+			if (!isnan(x[i] && !isinf(x[i])) {
 			x[i]=0.0;
+			} else {
+			x[i]=NAN;
+			}
 		else
 			x[i] = da * x[i] ;