Fix clang-tidy performance warnings in system/extra.

* Use more efficient overloaded string methods.

Bug: 30411878
Test: build with WITH_TIDY=1
Change-Id: If1a2931cab7f70e4a4bd5fcc06b2ae0260169cd8

1 files changed, 1 insertions, 1 deletions

diff --git a/preopt2cachename/preopt2cachename.cpp b/preopt2cachename/preopt2cachename.cpp
index 3fb887be..40d66b14 100644
--- a/preopt2cachename/preopt2cachename.cpp
+++ b/preopt2cachename/preopt2cachename.cpp
@@ -89,7 +89,7 @@ static bool SystemBFilenameToCacheFile(const std::string& file_location,
     LOG(ERROR) << "Unable to determine apk name from file name '" << file_location << "'";
     return false;
   }
-  std::string::size_type pos = file_location.find_last_of(".");
+  std::string::size_type pos = file_location.find_last_of('.');
   if (pos == std::string::npos) {
     LOG(ERROR) << "Invalid file location '" << file_location << "'";
     return false;