-Wpointer-sign: monitor.c.

-Wpointer-sign: monitor.c.

This fixes -Wpointer-sign issues in monitor.c.

Tested by building on x86_64 Fedora 17 w/ --enable-targets=all.

gdb/
2013-04-19  Pedro Alves  <palves@redhat.com>

	* monitor.c (monitor_write_memory, monitor_write_memory_bytes):
	Change type of 'myaddr' parameter to gdb_byte pointer.
	(monitor_write_memory_longlongs): Likewise.  Cast 'myaddr' pointer
	to 'long long' pointer instead of to 'unsigned long long'.
	(monitor_write_memory_block, monitor_read_memory_single)
	(monitor_read_memory): Change type of 'myaddr' parameter to
	gdb_byte pointer.