Undo bogus change that was introduced with kprobes.  It's not
really needed and it breaks some user applications because
it changes the signal for int 3 from SIGTRAP to SIGSEGV.

Cc: <prasanna@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>