download.pl: properly cleanup intermediate .hash file

It seems like after a build the /dl dir seems to now contain a .hash
file for each source file due to inproper cleanup so fix it by removing
those intermediate files before leaving the download action.

Fixes: 4e19cbc553 ("download: handle possibly invalid local tarballs")
Reported-by: Hannu Nyman <hannu.nyman@iki.fi>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit 52a5d0d27f)

scripts/download.pl

@@ -273,11 +273,11 @@ if (-f "$target/$filename") {
 		$sum =~ /^(\w+)\s*/ or die "Could not generate file hash\n";
 		$sum = $1;
 
+		cleanup();
 		exit 0 if $sum eq $file_hash;
 
 		die "Hash of the local file $filename does not match (file: $sum, requested: $file_hash) - deleting download.\n";
 		unlink "$target/$filename";
-		cleanup();
 	};
 }