Attempt to fix isinff.c

src/libc/gen/isinff.c

@@ -11,7 +11,7 @@
  * isinff(x) returns 1 is x is inf, -1 if x is -inf, else 0;
  * no branching!
  */
-int isinff (float x)
+int isinff (double x)
 {
 	long lx = *(long*) &x;
 	long v = (lx & 0x7fffffff) ^ 0x7f800000;