-Wpointer-sign: dwarf2-frame.c: Pass unsigned variable to safe_read_uleb128.

-Wpointer-sign: dwarf2-frame.c: Pass unsigned variable to safe_read_uleb128.

The 'bytes_read' change should be obvious.  As for the other hunk,
we're passing the address of the signed 'offset' to safe_read_uleb128,
which expects unsigned.  Fix it by passing the address of the unsigned
'utmp' instead, like already done on other spots in the file.

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

	* dwarf2-frame.c (execute_cfa_program): Make 'bytes_read' local
	unsigned.  Pass 'tmp' to safe_read_uleb128 instead of the signed
	'offset', and adjust.