Merge pull request #247111 from K900/requirefile-fix-error-message

requireFile: fix error message with SRI hashes

pkgs/build-support/trivial-builders/default.nix

···
         or
           nix-prefetch-url --type ${hashAlgo} file:///path/to/${name_}
       '';
-      hashAlgo = if hash != null then ""
+      hashAlgo = if hash != null then (builtins.head (lib.strings.splitString "-" hash))
             else if sha256 != null then "sha256"
             else "sha1";
+      hashAlgo_ = if hash != null then "" else hashAlgo;
       hash_ = if hash != null then hash
          else if sha256 != null then sha256
          else sha1;
···
     stdenvNoCC.mkDerivation {
       name = name_;
       outputHashMode = hashMode;
-      outputHashAlgo = hashAlgo;
+      outputHashAlgo = hashAlgo_;
       outputHash = hash_;
       preferLocalBuild = true;
       allowSubstitutes = false;