Merge pull request #2423 from stephentoub/path_unix_additionalchars

Fix currently inconsequential Path bug on Unix

Author: stephentoub

src/System.Runtime.Extensions/src/System/IO/Path.Unix.cs

@@ -16,7 +16,7 @@ public static partial class Path
 
         private static readonly char[] InvalidPathChars = { '\0' };
         private static readonly char[] InvalidFileNameChars = { '\0', '/' };
-        private static readonly char[] InvalidPathCharsWithAdditionalChecks = InvalidFileNameChars; // no additional checks on Unix
+        private static readonly char[] InvalidPathCharsWithAdditionalChecks = InvalidPathChars; // no additional checks on Unix
 
         private static readonly int MaxPath = Interop.libc.MaxPath;
         private static readonly int MaxComponentLength = Interop.libc.MaxName;