Revert previous change, OF_EXIST really returns HFILE_ERROR.

dlls/kernel/file.c

@@ -2071,8 +2071,5 @@ HFILE WINAPI OpenFile( LPCSTR name, OFSTRUCT *ofs, UINT mode )
 error:  /* We get here if there was an error opening the file */
     ofs->nErrCode = GetLastError();
     WARN("(%s): return = HFILE_ERROR error= %d\n", name,ofs->nErrCode );
-    if (mode & OF_EXIST)
-        return FALSE;
-    else
     return HFILE_ERROR;
 }

dlls/kernel/tests/file.c

@@ -1410,7 +1410,7 @@ static void test_OpenFile_exists(void)
     }
 
     hFile = OpenFile(".\\foo-bar-foo.baz", &ofs, OF_EXIST);
-    ok( hFile == FALSE, "hFile != FALSE : %ld\n", GetLastError());
+    ok( hFile == HFILE_ERROR, "hFile != HFILE_ERROR : %ld\n", GetLastError());
 }