Merge pull request #6263 from pauluap/equeue_gcc7_c++x11_warning

Clarify intention between comparison to zero and the shift operation

Author: cmonr

events/equeue/equeue.c

@@ -37,7 +37,7 @@ static inline int equeue_clampdiff(unsigned a, unsigned b) {
 // Increment the unique id in an event, hiding the event from cancel
 static inline void equeue_incid(equeue_t *q, struct equeue_event *e) {
     e->id += 1;
-    if (!(e->id << q->npw2)) {
+    if ((e->id << q->npw2) == 0) {
         e->id = 1;
     }
 }
@@ -469,7 +469,7 @@ void equeue_event_dtor(void *p, void (*dtor)(void *)) {
 }
 
 
-// simple callbacks 
+// simple callbacks
 struct ecallback {
     void (*cb)(void*);
     void *data;