Clean up error messages in the previous CL.

TIL PLOG already logs the errno message, so it got logged twice
SignalCatcher::Output. Switch to PLOG for the corresponding messages in
palette_android.cc for brevity, and switch to LOG in the caller since the
errno message already has been logged by then.

Test: adb shell killall -QUIT system_server with a nearly full data
  partition; check logcat output.
Bug: 130025619

Change-Id: I973b04461de3492e3cb3e5855fc06e99efe32c0a
diff --git a/libartpalette/system/palette_android.cc b/libartpalette/system/palette_android.cc
index 801f334..9c35d93 100644
--- a/libartpalette/system/palette_android.cc
+++ b/libartpalette/system/palette_android.cc
@@ -115,16 +115,16 @@
 
   bool success = true;
   if (!android::base::WriteFully(output_fd, msg, msg_len)) {
-    LOG(ERROR) << "Failed to write tombstoned output: " << strerror(errno);
+    PLOG(ERROR) << "Failed to write tombstoned output";
     success = false;
   } else if (TEMP_FAILURE_RETRY(fsync(output_fd)) == -1) {
-    LOG(ERROR) << "Failed to fsync tombstoned output: " << strerror(errno);
+    PLOG(ERROR) << "Failed to fsync tombstoned output";
     success = false;
   } else if (close(output_fd.release()) == -1) {
     // Shouldn't retry close after EINTR because the fd has been closed anyway,
     // but don't count it as a failure either.
     if (errno != EINTR) {
-      LOG(ERROR) << "Failed to close tombstoned output: " << strerror(errno);
+      PLOG(ERROR) << "Failed to close tombstoned output";
       success = false;
     }
   }
diff --git a/runtime/signal_catcher.cc b/runtime/signal_catcher.cc
index 1aa8487..33f582c 100644
--- a/runtime/signal_catcher.cc
+++ b/runtime/signal_catcher.cc
@@ -18,7 +18,6 @@
 
 #include <csignal>
 #include <cstdlib>
-#include <cstring>
 #include <fcntl.h>
 #include <pthread.h>
 #include <sys/stat.h>
@@ -111,7 +110,7 @@
     LOG(INFO) << "Wrote stack traces to tombstoned";
   } else {
     CHECK(status == PaletteStatus::kCheckErrno);
-    PLOG(ERROR) << "Failed to write stack traces to tombstoned: " << strerror(errno);
+    LOG(ERROR) << "Failed to write stack traces to tombstoned";
     LOG(INFO) << s;
   }
 #else