Slightly refactor varstr_sortsupport() to improve readability.

Author: Andreas Karlsson
Discussion: https://postgr.es/m/69c2a864-846f-4309-bd5a-aaa1c34f9a11@proxel.se

src/backend/utils/adt/varlena.c

@@ -1917,7 +1917,6 @@ varstr_sortsupport(SortSupport ssup, Oid typid, Oid collid)
 		}
 		else
 			ssup->comparator = varlenafastcmp_locale;
-	}
 
 		/*
 		 * Unfortunately, it seems that abbreviation for non-C collations is
@@ -1934,8 +1933,9 @@ varstr_sortsupport(SortSupport ssup, Oid typid, Oid collid)
 		 * categorically, we may still want or need to disable it for particular
 		 * platforms.
 		 */
-	if (!collate_c && !pg_strxfrm_enabled(locale))
+		if (!pg_strxfrm_enabled(locale))
 			abbreviate = false;
+	}
 
 	/*
 	 * If we're using abbreviated keys, or if we're using a locale-aware