UML needs to use siglongjmp instead of longjmp everywhere.  This patch fixes
the remaining longjmp/jmp_buf occurrences.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>