[gcc r16-6555] libstdc++: Remove redundant return statement after static_assert(false)

[Jonathan Wakely]

https://gcc.gnu.org/g:a6c853112d92c68f5147de4bea7f1983ebd60f0b

commit r16-6555-ga6c853112d92c68f5147de4bea7f1983ebd60f0b
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jan 6 16:18:21 2026 +0000

    libstdc++: Remove redundant return statement after static_assert(false)
    
    Jakub's fix for PR c++/91388 means that we don't need an unreachable
    return statement after static_assert(false).
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/atomic_wait.h (__wait_args::_M_setup_wait):
            Remove unreachable return statement.
    
    Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>

Diff:
---
 libstdc++-v3/include/bits/atomic_wait.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/libstdc++-v3/include/bits/atomic_wait.h b/libstdc++-v3/include/bits/atomic_wait.h
index 10f4f9134676..b6240a95370f 100644
--- a/libstdc++-v3/include/bits/atomic_wait.h
+++ b/libstdc++-v3/include/bits/atomic_wait.h
@@ -226,10 +226,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	      else if constexpr (sizeof(_Tp) == sizeof(__UINT64_TYPE__))
 		return __builtin_bit_cast(_Tp, (__UINT64_TYPE__)_M_old);
 	      else
-		{
-		  static_assert(false); // Unsupported size
-		  return {};
-		}
+		static_assert(false); // Unsupported size
 	    }
 
 	  if constexpr (!__platform_wait_uses_type<_Tp>)