wrc_main: only in slave mode, when link goes down switch SoftPLL to lock to local osc

wrc_main.c

@@ -182,7 +182,8 @@ int main(void)
         break;
 
       case LINK_WENT_DOWN:
-        spll_init(SPLL_MODE_FREE_RUNNING_MASTER, 0, 1);
+        if( wrc_ptp_get_mode() == WRC_MODE_SLAVE )
+          spll_init(SPLL_MODE_FREE_RUNNING_MASTER, 0, 1);
         break;
     }