cleanup various minor issues reported by nsz

the changes to syscall_ret are mostly no-ops in the generated code,
just cleanup of type issues and removal of some implementation-defined
behavior. the one exception is the change in the comparison value,
which is fixed so that 0xf...f000 (which in principle could be a valid
return value for mmap, although probably never in reality) is not
treated as an error return.

1 files changed, 1 insertions, 1 deletions

diff --git a/include/sys/syscall.h b/include/sys/syscall.h
index c86135a3..901941aa 100644
--- a/include/sys/syscall.h
+++ b/include/sys/syscall.h
@@ -4,7 +4,7 @@
 extern "C" {
 #endif
 
-long __syscall_ret(long);
+long __syscall_ret(unsigned long);
 long __syscall(long, ...);
 long syscall(long, ...);