ClangTidy fixes for call/

These are manual edits please verify there are no typos.
Feel free to auto-submit if there are no issues.

Bug: webrtc:10410
Change-Id: I08ff36bd689fa7c3716c8e7017bd571cc9f09f35
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/127642
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27125}
diff --git a/call/bitrate_estimator_tests.cc b/call/bitrate_estimator_tests.cc
index 017cecc..87e37df 100644
--- a/call/bitrate_estimator_tests.cc
+++ b/call/bitrate_estimator_tests.cc
@@ -66,7 +66,7 @@
         num_popped++;
         EXPECT_TRUE(a.find(b) != std::string::npos) << a << " != " << b;
       }
-      if (expected_log_lines_.size() <= 0) {
+      if (expected_log_lines_.empty()) {
         if (num_popped > 0) {
           done_.Set();
         }