MDEV-34187 On startup: UBSAN: runtime error: applying zero offset to null...

MDEV-34187 On startup: UBSAN: runtime error: applying zero offset to null pointer in skip_trailing_space and my_hash_sort_utf8mb3_general1400_nopad_as_ci

The last element in func_array_oracle_overrides[] equal to {0,0}
was erroneously passed to Native_functions_hash::replace().
Removing this element.

sql/item_create.cc

@@ -5687,8 +5687,7 @@ const Native_func_registry func_array_oracle_overrides[] =
   { { STRING_WITH_LEN("REGEXP_REPLACE") },
                                     BUILDER(Create_func_regexp_replace_oracle)},
   { { STRING_WITH_LEN("RPAD") },    BUILDER(Create_func_rpad_oracle)},
-  { { STRING_WITH_LEN("RTRIM") },   BUILDER(Create_func_rtrim_oracle)},
-  { {0, 0}, NULL}
+  { { STRING_WITH_LEN("RTRIM") },   BUILDER(Create_func_rtrim_oracle)}
 };
 
 Native_func_registry_array