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, 2 insertions, 2 deletions

diff --git a/src/linux/sbrk.c b/src/linux/sbrk.c
index 5fab74be..36437653 100644
--- a/src/linux/sbrk.c
+++ b/src/linux/sbrk.c
@@ -1,7 +1,7 @@
-#include <stddef.h>
+#include <stdint.h>
 #include "syscall.h"
 
-void *sbrk(ptrdiff_t inc)
+void *sbrk(intptr_t inc)
 {
 	unsigned long cur = syscall(SYS_brk, 0);
 	if (inc && syscall(SYS_brk, cur+inc) != cur+inc) return (void *)-1;