[gnoduino: 186/237] Bug fix in replace().

[Lucian Langa <lucilanga src gnome org>]

commit 5dbe1f06e99fb886a55717e21b27e6092e03090f
Author: David A. Mellis <d mellis arduino cc>
Date:   Tue Oct 25 11:15:14 2011 -0400

    Bug fix in replace().
    
    http://code.google.com/p/arduino/issues/detail?id=694

 arduino/cores/arduino/WString.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/arduino/cores/arduino/WString.cpp b/arduino/cores/arduino/WString.cpp
index ad8d828..3e81331 100644
--- a/arduino/cores/arduino/WString.cpp
+++ b/arduino/cores/arduino/WString.cpp
@@ -593,7 +593,7 @@ void String::replace(const String& find, const String& replace)
 		if (size == len) return;
 		if (size > capacity && !changeBuffer(size)) return; // XXX: tell user!
 		int index = len - 1;
-		while ((index = lastIndexOf(find, index)) >= 0) {
+		while (index >= 0 && (index = lastIndexOf(find, index)) >= 0) {
 			readFrom = buffer + index + find.len;
 			memmove(readFrom + diff, readFrom, len - (readFrom - buffer));
 			len += diff;