morphisms: remove 'return 0;' at end since it is now added by default

morphisms/value_delim.morphism-base

@@ -27,8 +27,6 @@ morph_seqseq_valsep_uint8 (T: Type, SrcDelim: T, DstDelim: T)
             length_prefix_uint64_t_array_uint8_t_push( dst, src->items[i] );
         }
     }
-
-    return 0;
 ```
 
 
@@ -66,8 +64,6 @@ morph_seqseq_as_valsep_to_lenpfx (T: Type, Delim: T, EscKey: T)
             cur++;
         }
     }
-
-    return 0;
 ```
 
 morph_seqeq_as_lenpfx_to_valsep (T: Type, Delim: T, EscKey: T)
@@ -94,6 +90,4 @@ morph_seqeq_as_lenpfx_to_valsep (T: Type, Delim: T, EscKey: T)
             length_prefix_uint64_t_array_uint8_t_push( Delim );
         }
     }
-
-    return 0;
 ```