Fix recipient santitization

Need to quote all special characters, not just the first one

Signed-off-by: Horst H. von Brand <vonbrand@inf.utfsm.cl>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/git-send-email.perl b/git-send-email.perl
index be4a20d..5630276 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -633,7 +633,7 @@
 
 	# double quotes are needed if specials or CTLs are included
 	elsif ($recipient_name =~ /[][()<>@,;:\\".\000-\037\177]/) {
-		$recipient_name =~ s/(["\\\r])/\\$1/;
+		$recipient_name =~ s/(["\\\r])/\\$1/g;
 		$recipient_name = "\"$recipient_name\"";
 	}