-Wpointer-sign: alpha-tdep.c.

-Wpointer-sign: alpha-tdep.c.

../../src/gdb/alpha-tdep.c: In function ‘alpha_extract_return_value’:
../../src/gdb/alpha-tdep.c:520:4: error: pointer targets in passing argument 3 of ‘regcache_cooked_read_signed’ differ in signedness [-Werror=pointer-sign]
In file included from ../../src/gdb/alpha-tdep.c:36:0:

We use regcache_cooked_read_unsigned everywhere else too.

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

	* alpha-tdep.c (alpha_extract_return_value): Use
	regcache_cooked_read_unsigned to read 'v0'.