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, 3 insertions, 3 deletions

diff --git a/src/internal/syscall_ret.c b/src/internal/syscall_ret.c
index 4f159e0b..e4a1bdbe 100644
--- a/src/internal/syscall_ret.c
+++ b/src/internal/syscall_ret.c
@@ -3,9 +3,9 @@
 
 long __syscall_ret(unsigned long r)
 {
-	if (r >= (unsigned long)-1 - 4096) {
-		errno = -(long)r;
+	if (r > -4096UL) {
+		errno = -r;
 		return -1;
 	}
-	return (long)r;
+	return r;
 }