sparc: fix the return value of module_alloc()

In case of error, function module_alloc() in other platform never
returns ERR_PTR(), and all of the user only check for NULL, so
we'd better return NULL instead of ERR_PTR().

dpatch engine is used to auto generated this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c
index bae6ab6..f1ddc0d 100644
--- a/arch/sparc/kernel/module.c
+++ b/arch/sparc/kernel/module.c
@@ -48,9 +48,7 @@
 		return NULL;
 
 	ret = module_map(size);
-	if (!ret)
-		ret = ERR_PTR(-ENOMEM);
-	else
+	if (ret)
 		memset(ret, 0, size);
 
 	return ret;