Fixing crash on -J (proxycmd)

[Lluís Batlle i Rossell]

Hello,

since 0.53 (at least), using -J crashes on mips. With valgrind, I tracked this
down to a bad free.

Here is the patch attached that should fix it. At least, valgrind doesn't
complain. I'll test it with mips later.

Regards,
Lluís.

diff -r 5ba19d00da08 cli-runopts.c
--- a/cli-runopts.c     Sun May 26 18:43:00 2013 +0800
+++ b/cli-runopts.c     Mon Jun 17 19:19:12 2013 +0000
@@ -383,6 +383,13 @@
                exit(EXIT_FAILURE);
        }
 
+#ifdef ENABLE_CLI_PROXYCMD
+    if (cli_opts.proxycmd) {
+        /* To match the common path of m_freeing it */
+        cli_opts.proxycmd = m_strdup(cli_opts.proxycmd);
+    }
+#endif
+
        if (cli_opts.remoteport == NULL) {
                cli_opts.remoteport = "22";
        }