fix: IRQ_LinkChg

Author: jerzyjamroz

evrMrmApp/src/drvem.cpp

@@ -1425,6 +1425,12 @@ EVRMRM::drain_fifo()
             BITSET(NAT,32, base, Control, Control_fiforst);
         }
 
+        if (status&(IRQ_LinkChg)) {
+            // clear fifo if link established
+            BITSET(NAT,32, base, Control, Control_fiforst);
+            printf("================= IRQ_LinkChg =============\n");
+        }
+
         int iflags=epicsInterruptLock();
 
         //*