POLY: add delete_polynom() function

This deletes both the internal structure and the pointer.

src/poly.c

@@ -74,6 +74,20 @@ void init_polynom_size(pb_poly *new_poly, mp_int *chara, int size)
 	}
 }
 
+/**
+ * This deletes the internal structure of a polynomial,
+ * and frees the pointer. Don't call this on stack variables,
+ * this is intended for use after ntru_ functions, that
+ * return a polynomial pointer.
+ *
+ * @param poly the polynomial to delete
+ */
+void delete_polynom(pb_poly *poly)
+{
+	pb_clear(poly);
+	free(poly);
+}
+
 /**
  * Print the polynomial in a human readable format to stdout.
  *

src/poly.h

@@ -33,6 +33,8 @@ void init_polynom(pb_poly *new_poly, mp_int *chara);
 
 void init_polynom_size(pb_poly *new_poly, mp_int *chara, int size);
 
+void delete_polynom(pb_poly *new_poly);
+
 void draw_polynom(pb_poly * const poly);
 
 #endif /* NTRU_POLY_H */