fix unused variable warnings in new nextafter/nexttoward code

apparently initializing a variable is not "using" it but assigning to
it is "using" it. i don't really like this fix, but it's better than
trying to make a bigger cleanup just before a release, and it should
work fine (tested against nsz's math tests).

1 files changed, 2 insertions, 1 deletions

diff --git a/src/math/nextafter.c b/src/math/nextafter.c
index d9e29236..e4bfb022 100644
--- a/src/math/nextafter.c
+++ b/src/math/nextafter.c
@@ -30,7 +30,8 @@ double nextafter(double x, double y)
 		return x + x;
 	/* raise underflow if ux.value is subnormal or zero */
 	if (e == 0) {
-		volatile double z = x*x + ux.value*ux.value;
+		volatile double z;
+		z = x*x + ux.value*ux.value;
 	}
 	return ux.value;
 }