Add reference counter init routine

This is useful when reference counter is initialized in non-zeroed
memory (or assuming atomic variable is not properly initialized by
memseting to zero).

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>

src/utils/utils_refcnt.c

@@ -5,6 +5,14 @@
 
 #include "../utils/utils_refcnt.h"
 
+void ocf_refcnt_init(struct ocf_refcnt *rc)
+{
+	env_atomic_set(&rc->counter, 0);
+	env_atomic_set(&rc->freeze, 0);
+	env_atomic_set(&rc->callback, 0);
+	rc->cb = NULL;
+}
+
 void ocf_refcnt_dec(struct ocf_refcnt *rc)
 {
 	int val = env_atomic_dec_return(&rc->counter);