sunrpc: rework proc handlers to take advantage of the new buffer

Now that we're allocating an extra slot for the NULL terminated string,
use scnprintf() and write directly into the buffer.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>

net/sunrpc/sysctl.c

diff --git a/net/sunrpc/sysctl.c b/net/sunrpc/sysctl.c
index 999eee1..31ed530 100644
--- a/net/sunrpc/sysctl.c
+++ b/net/sunrpc/sysctl.c
@@ -117,14 +117,8 @@ proc_dodebug(struct ctl_table *table, int write, void *buffer, size_t *lenp,
 		if (strcmp(table->procname, "rpc_debug") == 0)
 			rpc_show_tasks(&init_net);
 	} else {
-		len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);
-		if (len > left)
-			len = left;
-		memcpy(buffer, tmpbuf, len);
-		if ((left -= len) > 0) {
-			*((char *)buffer + len) = '\n';
-			left--;
-		}
+		len = scnprintf(buffer, *lenp, "0x%04x\n", *(unsigned int *) table->data);
+		left -= len;
 	}
 
 done:

net/sunrpc/xprtrdma/svc_rdma.c

diff --git a/net/sunrpc/xprtrdma/svc_rdma.c b/net/sunrpc/xprtrdma/svc_rdma.c
index 526da5d..9b3a113 100644
--- a/net/sunrpc/xprtrdma/svc_rdma.c
+++ b/net/sunrpc/xprtrdma/svc_rdma.c
@@ -90,20 +90,8 @@ static int read_reset_stat(struct ctl_table *table, int write,
 	if (write)
 		atomic_set(stat, 0);
 	else {
-		char str_buf[32];
-		int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
-		if (len >= 32)
-			return -EFAULT;
-		len = strlen(str_buf);
-		if (*ppos > len) {
-			*lenp = 0;
-			return 0;
-		}
-		len -= *ppos;
-		if (len > *lenp)
-			len = *lenp;
-		if (len)
-			memcpy(buffer, str_buf, len);
+		size_t len = scnprintf(buffer, *lenp, "%d\n",
+				       atomic_read(stat));
 		*lenp = len;
 		*ppos += len;
 	}