This patch fixes a bug introduced in the last batch of signal fixes.  The
system call return value should only be reset if called diectly from a
system call, i.e.  sigsuspend.  The fixes added earlier caused any
interrupted non-zero system call return to be reset, confusing fork and
vfork, among others.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>