math/test/test.cpp has invalid calls

The function calls ceil() and floor() but passes an int and there
is obviously no implementation for that so clang fails.

It seems like exp should be a float from this code.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/lib/mathlib/math/test/test.cpp

@@ -59,6 +59,9 @@ void __EXPORT float2SigExp(
 	float &sig,
 	int &exp)
 {
+// FIXME - This code makes no sense when exp is an int
+// FIXME - isnan and isinf not defined for QuRT
+#ifndef __PX4_QURT
 	if (isnan(num) || isinf(num)) {
 		sig = 0.0f;
 		exp = -99;
@@ -79,6 +82,7 @@ void __EXPORT float2SigExp(
 	} else {
 		exp = floor(exp);
 	}
+#endif
 
 	sig = num;