mq_receive.3: spfix

Reported-by: James Noble <James.Noble@daktronics.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
diff --git a/man3/mq_receive.3 b/man3/mq_receive.3
index b8c032c..36f49de 100644
--- a/man3/mq_receive.3
+++ b/man3/mq_receive.3
@@ -70,7 +70,7 @@
 attribute of the queue (see
 .BR mq_getattr (3)).
 If
-.I prio
+.I msg_prio
 is not NULL, then the buffer to which it points is used
 to return the priority associated with the received message.