refactor(3p/nix): Apply clang-tidy's modernize-* fixes r/787

This applies the modernization fixes listed here:

https://clang.llvm.org/extra/clang-tidy/checks/list.html

The 'modernize-use-trailing-return-type' fix was excluded due to my
personal preference (more specifically, I think the 'auto' keyword is
misleading in that position).

1 files changed, 1 insertions, 1 deletions

diff --git a/third_party/nix/src/libstore/derivations.cc b/third_party/nix/src/libstore/derivations.cc
index 1b6f160653c9..2955056e06ea 100644
--- a/third_party/nix/src/libstore/derivations.cc
+++ b/third_party/nix/src/libstore/derivations.cc
@@ -331,7 +331,7 @@ DrvHashes drvHashes;
 Hash hashDerivationModulo(Store& store, Derivation drv) {
   /* Return a fixed hash for fixed-output derivations. */
   if (drv.isFixedOutput()) {
-    DerivationOutputs::const_iterator i = drv.outputs.begin();
+    auto i = drv.outputs.begin();
     return hashString(htSHA256, "fixed:out:" + i->second.hashAlgo + ":" +
                                     i->second.hash + ":" + i->second.path);
   }