[glibc/azanella/ubsan-undef] math: Fix UB in flt-32 nearbyint

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0a933c9bf75088406677d72da03604669361e0d4

commit 0a933c9bf75088406677d72da03604669361e0d4
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue May 6 13:43:36 2025 +0000

    math: Fix UB in flt-32 nearbyint
    
    UBSAN: Undefined behaviour in ../sysdeps/ieee754/flt-32/s_nearbyintf.c:53:4 left shift of 1 by 31 cannot be represented in type 'int'

Diff:
---
 sysdeps/ieee754/flt-32/s_nearbyintf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sysdeps/ieee754/flt-32/s_nearbyintf.c b/sysdeps/ieee754/flt-32/s_nearbyintf.c
index 5dd0e8f8af..8ae80738fc 100644
--- a/sysdeps/ieee754/flt-32/s_nearbyintf.c
+++ b/sysdeps/ieee754/flt-32/s_nearbyintf.c
@@ -34,7 +34,8 @@ __nearbyintf (float x)
 		-8.3886080000e+06, /* 0xcb000000 */
   };
   fenv_t env;
-  int32_t i0, j0, sx;
+  int32_t i0, j0;
+  uint32_t sx;
   float w, t;
   GET_FLOAT_WORD (i0, x);
   sx = (i0 >> 31) & 1;