nano 2.2.1: fix crash in search

From: Tito Ragusa <address@hidden>

Fix a crash in nano's search mode

Signed-off-by: Tito Ragusa <address@hidden>

--- src/search.c.orig   2009-12-30 22:37:13.000000000 +0100
+++ src/search.c        2009-12-30 22:38:23.000000000 +0100
@@ -1357,7 +1357,7 @@
     assert(hage != NULL && hbot != NULL);

     /* If this string is already in the history, delete it. */
-    p = find_history(*hage, *hbot, s, (size_t)-1);
+    p = find_history(*hage, *hbot, s, strlen(s));

     if (p != NULL) {
        filestruct *foo, *bar;