Don't use qSNaN()

signalling NaNs are generally undesirable as they with trigger a signal
on any further arithmetics operation done to them.

Change-Id: Icebae3d4eb22c8294b11da234a2ba5c7e31b9733
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/libs/qmljs/parser/qmljsengine_p.cpp

@@ -53,7 +53,7 @@ static inline int toDigit(char c)
 double integerFromString(const char *buf, int size, int radix)
 {
     if (size == 0)
-        return qSNaN();
+        return qQNaN();
 
     double sign = 1.0;
     int i = 0;
@@ -92,7 +92,7 @@ double integerFromString(const char *buf, int size, int radix)
         if (!qstrcmp(buf, "Infinity"))
             result = qInf();
         else
-            result = qSNaN();
+            result = qQNaN();
     } else {
         result = 0;
         double multiplier = 1;