libstore: simplify substitution handleEOF

both substitution goals add only this single fd to their wait set.

Change-Id: Ibf921f5bb3919106208a0871523b32c8f67fb3d3

src/libstore/build/drv-output-substitution-goal.cc

@@ -164,7 +164,7 @@ void DrvOutputSubstitutionGoal::work()
 
 void DrvOutputSubstitutionGoal::handleEOF(int fd)
 {
-    if (fd == downloadState->outPipe.readSide.get()) worker.wakeUp(shared_from_this());
+    worker.wakeUp(shared_from_this());
 }
 
 

src/libstore/build/substitution-goal.cc

@@ -296,7 +296,7 @@ void PathSubstitutionGoal::handleChildOutput(int fd, std::string_view data)
 
 void PathSubstitutionGoal::handleEOF(int fd)
 {
-    if (fd == outPipe.readSide.get()) worker.wakeUp(shared_from_this());
+    worker.wakeUp(shared_from_this());
 }