(re-)added ucfree() which does memset(0) and free() afterwards

include/pcp/mem.h

@@ -41,4 +41,7 @@ void *urmalloc(size_t s);
 /* resize a a pointer and fill the added remainder with zeroes */
 void *ucrealloc(void *d, size_t oldlen, size_t newlen);
 
+/* clear and free */
+void ucfree(void *d, size_t len);
+
 #endif /*  _HAVE_PCP_MEM */

libpcp/mem.c

@@ -65,3 +65,10 @@ void *ucrealloc(void *d, size_t oldlen, size_t newlen) {
 
   return value;
 }
+
+void ucfree(void *d, size_t len) {
+  if(d != NULL) {
+    memset(d, 0, len);
+    free(d);
+  }
+}