refactor: minor refactoring for &-concatenated strings

Author: kio-watanabe

cobj/cobj.c

@@ -1817,7 +1817,6 @@ static void package_name_to_path(char *buff, char *package_name) {
       *b_p = *p_p;
     }
   }
-  *b_p = '\0';
 }
 
 static int process_compile(struct filename *fn) {

cobj/tree.c

@@ -474,7 +474,7 @@ struct cb_literal *build_concat_literal(enum cb_category category,
     p->segment_sizes = cobc_malloc(sizeof(size_t) * (sgmt_count + 1));
     memcpy(p->segment_sizes, sgmt_sizes, sizeof(size_t) * sgmt_count);
   }
-  memcpy(p->segment_sizes + sgmt_count, &size2, sizeof(size_t));
+  p->segment_sizes[sgmt_count] = size2;
   p->segment_count = sgmt_count + 1;
 
   return p;