Merge pull request #9271 from keszybz/if-fix

fix: gcc complains about if which doesn't guard the indented statement
(cherry picked from commit 8d663462938a333a4e81cce1005437f141cd11fa)
Change-Id: Ifa2e65502de4000935549dde82ab1b5867e2f0ed

src/libstore/build/local-derivation-goal.cc

@@ -1553,10 +1553,11 @@ void LocalDerivationGoal::addDependency(const StorePath & path)
             Path source = worker.store.Store::toRealPath(path);
             Path target = chrootRootDir + worker.store.printStorePath(path);
 
-            if (pathExists(target))
+            if (pathExists(target)) {
                 // There is a similar debug message in doBind, so only run it in this block to not have double messages.
                 debug("bind-mounting %s -> %s", target, source);
                 throw Error("store path '%s' already exists in the sandbox", worker.store.printStorePath(path));
+            }
 
             /* Bind-mount the path into the sandbox. This requires
                entering its mount namespace, which is not possible