Comparison, not set :) Thanks mvanbaak.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@101869 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_authenticate.c

@@ -159,7 +159,7 @@ static int auth_exec(struct ast_channel *chan, void *data)
 					continue;
 
 				len = strlen(buf) - 1;
-				if (buf[len - 1] = '\n')
+				if (buf[len - 1] == '\n')
 					buf[len - 1] = '\0';
 
 				if (ast_test_flag(&flags, OPT_MULTIPLE)) {