core: lexer: Add token for 'return' keyword

Signed-off-by: Chloe M. <chloe@mirocom.org>

core/lexer.c

@@ -180,6 +180,11 @@ lexer_check_kw(struct cescal_state *state, struct token *res)
         }
 
         break;
+    case 'r':
+        if (strcmp(res->s, "return") == 0) {
+            res->type = TT_RETURN;
+            return;
+        }
     }
 }