add malloc error

Author: ben-schwen

src/forder.c

@@ -942,6 +942,9 @@ void radix_i(int from, int to, int radix) {
     push(&my_n, 1);
     TEND(5);
     continue;
+  } else if (my_n < 1) {
+    // do not sort for my_n < 1 since we do not cater for this later
+    continue;
   }
   else if (my_n<=256) {
     // if nth==1
@@ -955,8 +958,10 @@ void radix_i(int from, int to, int radix) {
 
     uint8_t *restrict my_key = key[radix]+from;  // safe to write as we don't use this radix again
     uint8_t *o = (uint8_t *)malloc(my_n * sizeof(uint8_t));
-    if (!o)
+    if (!o) {
+      free(queue);
       STOP(_("Failed to allocate %zu bytes for '%s'."), my_n * sizeof(uint8_t), "o"); // # nocov
+    }
     // if last key (i.e. radix+1==nradix) there are no more keys to reorder so we could reorder osub by reference directly and save allocating and populating o just
     // to use it once. However, o's type is uint8_t so many moves within this max-256 vector should be faster than many moves in osub (4 byte or 8 byte ints) [1 byte
     // type is always aligned]