fix naming and windows

Author: matu3ba

lib/std/os.zig

@@ -4843,9 +4843,9 @@ pub fn lseek_CUR_get(fd: fd_t) SeekError!u64 {
     }
 }
 
-const UnsetFileInheritanceError = FcntlError || windows.SetHandleInformationError;
+const DisableFileInheritanceError = FcntlError || windows.SetHandleInformationError;
 
-pub inline fn disableFileInheritance(file_handle: fd_t) UnsetFileInheritanceError!void {
+pub inline fn disableFileInheritance(file_handle: fd_t) DisableFileInheritanceError!void {
     if (builtin.os.tag == .windows) {
         try windows.SetHandleInformation(file_handle, windows.HANDLE_FLAG_INHERIT, 0);
     } else {

test/standalone/childprocess_extrapipe/parent.zig

@@ -89,7 +89,7 @@ pub fn main() !void {
     if (builtin.target.os.tag == .windows) {
         var handle_flags: windows.DWORD = undefined;
         try windows.GetHandleInformation(pipe[1].?, &handle_flags);
-        std.debug.assert(handle_flags & windows.HANDLE_FLAG_INHERIT != 0);
+        std.debug.assert(handle_flags & windows.HANDLE_FLAG_INHERIT == 0);
     } else {
         const fcntl_flags = try os.fcntl(pipe[1], os.F.GETFD, 0);
         try std.testing.expect((fcntl_flags & os.FD_CLOEXEC) != 0);