Don't warn about c_functionend not being reachable

This is a special node that represents the end of the function so
isn't really unreachable snowball code.

compiler/generator.c

@@ -447,8 +447,10 @@ static int check_possible_signals(struct generator * g,
             if (res >= 0)
                 res = !res;
             if (res == 0 && p->right) {
-                fprintf(stderr, "%s:%d: warning: 'not' always signals f so following commands are unreachable\n",
-                        g->analyser->tokeniser->file, p->line_number);
+                if (p->right->type != c_functionend) {
+                    fprintf(stderr, "%s:%d: warning: 'not' always signals f so following commands are unreachable\n",
+                            g->analyser->tokeniser->file, p->line_number);
+                }
                 p->right = NULL;
             }
             return res;
@@ -567,8 +569,11 @@ static int check_possible_signals(struct generator * g,
                     // If any clause of the OR always signals t, then the OR
                     // always signals t.
                     if (q->right) {
-                        fprintf(stderr, "%s:%d: warning: command always signals t here so rest of 'or' is unreachable\n",
-                                g->analyser->tokeniser->file, q->line_number);
+                        if (q->right->type != c_functionend) {
+                            fprintf(stderr, "%s:%d: warning: command always signals t here so rest of 'or' is unreachable\n",
+                                    g->analyser->tokeniser->file,
+                                    q->line_number);
+                        }
                         q->right = NULL;
                     }
                     return 1;
@@ -595,9 +600,11 @@ int check_possible_signals_list(struct generator * g, struct node * p,
         if (res == 0) {
             // If any command always signals f, then the list always signals f.
             if (p->right) {
-                fprintf(stderr, "%s:%d: warning: command always signals f here so rest of %s is unreachable\n",
-                        g->analyser->tokeniser->file, p->line_number,
-                        (type == c_and ? "'and'" : "command list"));
+                if (p->right->type != c_functionend) {
+                    fprintf(stderr, "%s:%d: warning: command always signals f here so rest of %s is unreachable\n",
+                            g->analyser->tokeniser->file, p->line_number,
+                            (type == c_and ? "'and'" : "command list"));
+                }
                 p->right = NULL;
             }
             return res;