Delete useless variables of pmr171 and q900

rigs/guohetec/pmr171.c

@@ -349,7 +349,6 @@ static int pmr171_open(RIG *rig)
 {
     hamlib_port_t *rp = RIGPORT(rig);
     int retry = 5;
-    bool success = false;
     
     while (retry > 0) {
         rig_flush(rp);
@@ -357,7 +356,6 @@ static int pmr171_open(RIG *rig)
         
         int r = read_block(rp, reply, rlen);
         if (r > 0) {
-            success = true;
             break;
         }
         
@@ -365,7 +363,7 @@ static int pmr171_open(RIG *rig)
         hl_usleep(20 * 1000); 
     }
 
-    return success ? RIG_OK : RIG_OK;
+    return RIG_OK;
 }
 
  static int pmr171_send_cmd1(RIG *rig, unsigned char cmd, unsigned char *reply)

rigs/guohetec/q900.c

@@ -348,7 +348,6 @@ static int q900_open(RIG *rig)
 {
     hamlib_port_t *rp = RIGPORT(rig);
     int retry = 5;
-    bool success = false;
     
     while (retry > 0) {
         rig_flush(rp);
@@ -356,7 +355,6 @@ static int q900_open(RIG *rig)
         
         int r = read_block(rp, reply, rlen);
         if (r > 0) {
-            success = true;
             break;
         }