gitweb: Remove forgotten call to git_to_hash

On Aug 27th, Jakub Narebski sent a patch which removed the git_to_hash()
function and this call to it. The patch did not apply cleanly and had to
be applied manually. Removing the last chunk has obviously been forgotten.

See: commit  0aea337 and
     message <200608272345.26722.jnareb@gmail.com>

Signed-off-by: Dennis Stosberg <dennis@stosberg.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

gitweb/gitweb.perl

@@ -2778,10 +2778,6 @@ sub git_blobdiff {
 			@difftree
 				or die_error('404 Not Found', "Blob diff not found");
 
-		} elsif (defined $hash) { # try to find filename from $hash
-			if ($hash !~ /[0-9a-fA-F]{40}/) {
-				$hash = git_to_hash($hash);
-			}
 		} elsif (defined $hash &&
 		         $hash =~ /[0-9a-fA-F]{40}/) {
 			# try to find filename from $hash