setupapi: Remove a test of an undocumented function that is inconsistent across platforms.

dlls/setupapi/tests/stringtable.c

@@ -159,7 +159,7 @@ static void test_StringTableLookUpString(void)
 
 static void test_StringTableStringFromId(void)
 {
-    WCHAR *string2, *string3;
+    WCHAR *string2;
     int result;
 
     /* correct */
@@ -168,13 +168,6 @@ static void test_StringTableStringFromId(void)
     
     result=lstrcmpiW(string, string2);
     ok(result==0,"StringID %p does not match requested StringID %p\n",string,string2);
-
-    /* This should never work */
-    string3=pStringTableStringFromId(table,0);
-    ok(string3!=NULL,"Failed to look up string by ID from String Table\n");
-
-    result=lstrcmpiW(string, string3);
-    ok(result!=0,"StringID %p matches requested StringID %p\n",string,string3);
 }
 
 START_TEST(stringtable)