apt: funcs called with a string literal consisting of a single character

Benchmark:
- https://stackoverflow.com/questions/62058906/why-my-performance-benchmark-gives-me-wrong-results

References:
- https://clang.llvm.org/extra/clang-tidy/checks/performance/prefer-single-char-overloads.html

1 files changed, 1 insertions, 1 deletions

diff --git a/ftparchive/byhash.cc b/ftparchive/byhash.cc
index b24f6158e..8013bd7a6 100644
--- a/ftparchive/byhash.cc
+++ b/ftparchive/byhash.cc
@@ -50,7 +50,7 @@ void DeleteAllButMostRecent(std::string dir, int KeepFiles)
 std::string GenByHashFilename(std::string ByHashOutputFile, HashString const &h)
 {
    std::string const ByHash = "/by-hash/" + h.HashType() + "/" + h.HashValue();
-   size_t trailing_slash = ByHashOutputFile.find_last_of("/");
+   size_t trailing_slash = ByHashOutputFile.find_last_of('/');
    if (trailing_slash == std::string::npos)
       trailing_slash = 0;
    ByHashOutputFile = ByHashOutputFile.replace(