fix obvious leaks in stats

Reference: /n/atom/patch/applied2013/statsleak
Date: Wed Dec  4 23:38:40 CET 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/stats.c	Wed Dec  4 23:38:34 2013
+++ /sys/src/cmd/stats.c	Wed Dec  4 23:38:34 2013
@@ -509,6 +509,7 @@
 
 	n = write(fd, tree, strlen(tree));
 	if(n < 0){
+		auth_freeAI(ai);
 		close(fd);
 		return -1;
 	}
@@ -518,10 +519,12 @@
 	if(n!=2 || buf[0]!='O' || buf[1]!='K'){
 		buf[sizeof buf - 1] = '\0';
 		werrstr("bad remote tree: %s\n", buf);
+		auth_freeAI(ai);
 		close(fd);
 		return -1;
 	}
 
+	auth_freeAI(ai);
 	return fd;
 }
 
@@ -1300,7 +1303,6 @@
 		fprint(2, "stats: can't find $sysname: %r\n");
 		exits("sysname");
 	}
-	mysysname = estrdup(mysysname);
 
 	nargs = 0;
 	ARGBEGIN{