Fix use of uninitialised variable on legacy pairing
Regression caused by e7daece858070d71cecf6ade4f0e3c93272c53ac:
==23899== Use of uninitialised value of size 4
==23899== at 0x49CD888: _itoa_word (_itoa.c:196)
==23899== by 0x49D1109: vfprintf (vfprintf.c:1613)
==23899== by 0x4A7506C: __vsprintf_chk (vsprintf_chk.c:86)
==23899== by 0x4A74FAC: __sprintf_chk (sprintf_chk.c:33)
==23899== by 0x4830E08: ba2str (stdio2.h:34)
==23899== by 0x1496B3: set_pin_length (security.c:514)
==23899== by 0x168399: pincode_cb (dbus-hci.c:179)
==23899== by 0x162E0D: pincode_cb (device.c:2135)
==23899== by 0x15AD55: pincode_reply (agent.c:416)
==23899== by 0x49467E0: ??? (in /lib/libdbus-1.so.3.5.2)
==23899== by 0x4934975: ??? (in /lib/libdbus-1.so.3.5.2)
==23899== by 0x4937B81: dbus_connection_dispatch (in /lib/libdbus-1.so.3.5.2)
==23899==
==23899== Conditional jump or move depends on uninitialised value(s)
==23899== at 0x49CD893: _itoa_word (_itoa.c:196)
==23899== by 0x49D1109: vfprintf (vfprintf.c:1613)
==23899== by 0x4A7506C: __vsprintf_chk (vsprintf_chk.c:86)
==23899== by 0x4A74FAC: __sprintf_chk (sprintf_chk.c:33)
==23899== by 0x4830E08: ba2str (stdio2.h:34)
==23899== by 0x1496B3: set_pin_length (security.c:514)
==23899== by 0x168399: pincode_cb (dbus-hci.c:179)
==23899== by 0x162E0D: pincode_cb (device.c:2135)
==23899== by 0x15AD55: pincode_reply (agent.c:416)
==23899== by 0x49467E0: ??? (in /lib/libdbus-1.so.3.5.2)
==23899== by 0x4934975: ??? (in /lib/libdbus-1.so.3.5.2)
==23899== by 0x4937B81: dbus_connection_dispatch (in /lib/libdbus-1.so.3.5.2)
1 file changed
