[newlib-cygwin] math_config.h: Fix signed overflow warning for 16-bit targets

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=86c31ae47b1a17e8d79968af2874b2a89b4326c5

commit 86c31ae47b1a17e8d79968af2874b2a89b4326c5
Author: Jon Beniston <jon@beniston.com>
Date:   Fri Aug 31 23:10:00 2018 +0100

    math_config.h: Fix signed overflow warning for 16-bit targets

Diff:
---
 newlib/libm/common/math_config.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/newlib/libm/common/math_config.h b/newlib/libm/common/math_config.h
index f28c52b..dcbc61a 100644
--- a/newlib/libm/common/math_config.h
+++ b/newlib/libm/common/math_config.h
@@ -155,7 +155,7 @@ issignalingf_inline (float x)
   uint32_t ix = asuint (x);
   if (!IEEE_754_2008_SNAN)
     return (ix & 0x7fc00000) == 0x7fc00000;
-  return 2 * (ix ^ 0x00400000) > 2u * 0x7fc00000;
+  return 2 * (ix ^ 0x00400000) > 0xFF800000u;
 }
 
 static inline int