[minor refactor] Add const attribute

Author: martinec

src/TransductionStack.cpp

@@ -1319,7 +1319,7 @@ for (;;) {
 
             /* If we arrive here, the variable was neither a normal one nor an output one,
              * so we try to match dictionary one */
-            struct dela_entry* entry=get_dic_variable(name,p->dic_variables);
+            const struct dela_entry* entry=get_dic_variable(name,p->dic_variables);
             if (entry==NULL) {
                /* If the variable is not defined properly */
                if (field[0]=='S') {
@@ -1340,7 +1340,7 @@ for (;;) {
             }
          }
 
-         struct dela_entry* entry=get_dic_variable(name,p->dic_variables);
+         const struct dela_entry* entry=get_dic_variable(name,p->dic_variables);
          if (entry==NULL) {
             switch (p->variable_error_policy) {
                case EXIT_ON_VARIABLE_ERRORS: fatal_error("Output error: undefined morphological variable %S\n",name); break;

src/TransductionStackTfst.cpp

@@ -262,7 +262,7 @@ while (s[i]!='\0') {
             }
          } else {
              /* Here we deal with dictionary variable things like $a.CODE$ */
-             struct dela_entry* entry=get_dic_variable(name,p->dic_variables);
+             const struct dela_entry* entry=get_dic_variable(name,p->dic_variables);
              if (entry==NULL) {
                  switch (p->variable_error_policy) {
                      case EXIT_ON_VARIABLE_ERRORS: fatal_error("Output error: undefined morphological variable %S\n",name);