nios2: use long for ssize_t

This is consistent with nios2-linux. And resolved the warning,

cmd_nvedit.c: In function `do_env_export':
cmd_nvedit.c:660: warning: size_t format, ssize_t arg (arg 3)

Signed-off-by Thomas Chou <[email protected]>

---
 arch/nios2/include/asm/posix_types.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

arch/nios2/include/asm/posix_types.h +1 -1

index c2deea6..6733640 100644
@@ -17,7 +17,7 @@ typedef unsigned short	__kernel_ipc_pid_t;
 typedef unsigned short	__kernel_uid_t;
 typedef unsigned short	__kernel_gid_t;
 typedef unsigned long	__kernel_size_t;
-typedef int		__kernel_ssize_t;
+typedef long		__kernel_ssize_t;
 typedef int		__kernel_ptrdiff_t;
 typedef long		__kernel_time_t;
 typedef long		__kernel_suseconds_t;