[PATCH] nios2: fix syscall_get_error()

["Dmitry V. Levin" <ldv@altlinux.org>]

According to documentation in include/asm-generic/syscall.h,
syscall_get_error() should return -ERRORCODE if the system call failed.

This change fixes syscall_get_error() implementation on nios2 to match
its own syscall_set_return_value(), the documentation, and other
architectures where syscall_get_error() returns a non-positive value.

Fixes: 1000197d80132 ("nios2: System calls handling")
Cc: stable@vger.kernel.org # v3.19+
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
---
 arch/nios2/include/asm/syscall.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/nios2/include/asm/syscall.h b/arch/nios2/include/asm/syscall.h
index 9de220854c4a..abf54addb804 100644
--- a/arch/nios2/include/asm/syscall.h
+++ b/arch/nios2/include/asm/syscall.h
@@ -35,7 +35,7 @@ static inline void syscall_rollback(struct task_struct *task,
 static inline long syscall_get_error(struct task_struct *task,
 				struct pt_regs *regs)
 {
-	return regs->r7 ? regs->r2 : 0;
+	return regs->r7 ? -regs->r2 : 0;
 }
 
 static inline long syscall_get_return_value(struct task_struct *task,
-- 
ldv