Update src/libraries/Common/src/Interop/Unix/System.Native/Interop.Me…

…mfdCreate.cs

Co-authored-by: Jan Kotas <[email protected]>

src/libraries/Common/src/Interop/Unix/System.Native/Interop.MemfdCreate.cs

@@ -15,19 +15,19 @@ internal static partial class Sys
         [LibraryImport(Libraries.SystemNative, EntryPoint = "SystemNative_MemfdSupported", SetLastError = true)]
         private static partial int MemfdSupportedImpl();
 
-        private static volatile int s_memfdSupported = -1;
+        private static volatile sbyte s_memfdSupported;
 
         internal static bool MemfdSupported
         {
             get
             {
-                int result = Interlocked.CompareExchange(ref s_memfdSupported, -1, -1);
-                if (result == -1)
+                int memfdSupported = s_memfdSupported;
+                if (memfdSupported == 0)
                 {
-                    result = MemfdSupportedImpl();
-                    Interlocked.Exchange(ref s_memfdSupported, result);
+                    Interlocked.CompareExchange(ref s_memfdSupported, MemfdSupportedImpl() ? 1 : -1, 0);
+                    memfdSupported = s_memfdSupported;
                 }
-                return result == 1;
+                return memfdSupported > 0;
             }
         }
     }