Bluetooth: fix thread safety issue.

Fixes #11428.

headers/os/bluetooth/LinkKeyUtils.h

@@ -24,12 +24,11 @@ public:
 		return (linkkey_t){{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}};
 	}
 	
-	static char* ToString(const linkkey_t lk) 
+	static BString ToString(const linkkey_t lk) 
 	{
-		// TODO: not safe
+		BString str;
-		static char str[50];
 
-		sprintf(str, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:"
+		str.SetToFormat("%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:"
 				"%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X", 
 				lk.l[0], lk.l[1], lk.l[2], lk.l[3], lk.l[4], lk.l[5],
 				lk.l[6], lk.l[7], lk.l[8], lk.l[9], lk.l[10], lk.l[11],

headers/os/bluetooth/bdaddrUtils.h

@@ -9,6 +9,8 @@
 #include <stdio.h>
 #include <string.h>
 
+#include <String.h>
+
 #include <bluetooth/bluetooth.h>
 
 namespace Bluetooth {
@@ -45,12 +47,11 @@ public:
 		memcpy(&dst, &src, sizeof(bdaddr_t));
 	}
 
-	static char* ToString(const bdaddr_t bdaddr)
+	static BString ToString(const bdaddr_t bdaddr)
 	{
-		// TODO: not safe
+		BString str;
-		static char str[18];
 
-		sprintf(str,"%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X",bdaddr.b[5],
+		str.SetToFormat("%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X",bdaddr.b[5],
 				bdaddr.b[4], bdaddr.b[3], bdaddr.b[2], bdaddr.b[1],
 				bdaddr.b[0]);
 		return str;

headers/private/bluetooth/PincodeWindow.h

@@ -27,7 +27,7 @@ public:
 							PincodeWindow(RemoteDevice* rDevice);
 	virtual void			MessageReceived(BMessage *msg);
 	virtual bool			QuitRequested();
-			void			SetBDaddr(const char* address);
+			void			SetBDaddr(BString address);
 
 private:
 			void			InitUI();

src/kits/bluetooth/UI/PincodeWindow.cpp

@@ -187,7 +187,7 @@ bool PincodeWindow::QuitRequested()
 }
 
 
-void PincodeWindow::SetBDaddr(const char* address)
+void PincodeWindow::SetBDaddr(BString address)
 {
 	BString label;