[glibc] math: Fix test-fenv.c feupdateenv tests

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=497e4d503025c794a771d2c124123178f557623a

commit 497e4d503025c794a771d2c124123178f557623a
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue Jan 9 16:40:33 2024 -0300

    math: Fix test-fenv.c feupdateenv tests
    
    The feupdateenv tests added by 802aef27b2 do not restore the floating
    point mask, which might keep some floating point exception enabled and
    thus make the feupdateenv_single_test raise an unexpected signal.
    
    Checked on x86_64-linux-gnu and aarch64-linux-gnu (on Apple M1 trapping
    is supported).
    Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>

Diff:
---
 math/test-fenv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/math/test-fenv.c b/math/test-fenv.c
index 9db6789e64..8d39181b14 100644
--- a/math/test-fenv.c
+++ b/math/test-fenv.c
@@ -659,6 +659,7 @@ static void
 feupdate_single_test (const char *flag_name, int fe_exc)
 {
   feenv_nomask_test (flag_name, fe_exc, feupdateenv);
+  fesetenv (FE_DFL_ENV);
   feenv_mask_test (flag_name, fe_exc, feupdateenv);
 }
 #endif