roll: pigweed, pw_toolchain: pw_channel: Cleanup redundant checks in epoll_channel

The Channel class already checks for openness before
invoking the `Do` methods.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/218376
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
pigweed, pw_toolchain Rolled-Commits: 1d074293f52947e..5a8f064e15304d6
Roller-URL: https://ci.chromium.org/b/8744037428913670129
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ibc6c585f5890b135b60272a2812a86ad47cda7f6
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/218453
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/WORKSPACE b/WORKSPACE
index d93a813..5916272 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -84,8 +84,8 @@
     name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-06-26.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8744037818450798257.
-    commit = "1d074293f52947eb6492a2b563f62c730a5d6fb2",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8744037428913670129.
+    commit = "5a8f064e15304d6474591a45773377c53c48c1f3",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
 )
 
@@ -93,8 +93,8 @@
     name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-06-26.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8744037818450798257.
-    commit = "1d074293f52947eb6492a2b563f62c730a5d6fb2",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8744037428913670129.
+    commit = "5a8f064e15304d6474591a45773377c53c48c1f3",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
     strip_prefix = "pw_toolchain_bazel",
 )