posix: trivial error message cleanup

base/process_util_posix.cc

Index: base/process_util_posix.cc
diff --git a/base/process_util_posix.cc b/base/process_util_posix.cc
index 45efe8bdcbd0ec29a057b716c0c6692ff9911948..a26b4d3b73ac2cc700eec01f0043c29b577666d8 100644
--- a/base/process_util_posix.cc
+++ b/base/process_util_posix.cc
@@ -329,7 +329,7 @@ bool DidProcessCrash(bool* child_exited, ProcessHandle handle) {
   int status;
   const int result = HANDLE_EINTR(waitpid(handle, &status, WNOHANG));
   if (result == -1) {
-    LOG(ERROR) << "waitpid failed pid:" << handle << " errno:" << errno;
+    LOG(ERROR) << "waitpid(" << handle << "): " << strerror(errno);
     if (child_exited)
       *child_exited = false;
     return false;