obmc-console: Fix readability-isolate-declaration

For example:

```
/usr/bin/clang-tidy -checks=-*, readability-isolate-declaration -export-fixes /tmp/tmpoo7fbs72/tmpo8xiwfxs.yaml -p=build /mnt/host/andrew/home/andrew/src/openbmc/obmc-console/test/test-client-escape.c
/mnt/host/andrew/home/andrew/src/openbmc/obmc-console/build/../config.c:61:2: error: multiple declarations in a single statement reduces readability [readability-isolate-declaration,-warnings-as-errors]
        char *name, *value;
        ^~~~~~~~~~~~~~~~~~~
/mnt/host/andrew/home/andrew/src/openbmc/obmc-console/build/../config.c:62:2: error: multiple declarations in a single statement reduces readability [readability-isolate-declaration,-warnings-as-errors]
        char *p, *line;
        ^~~~~~~~~~~~~~~
/mnt/host/andrew/home/andrew/src/openbmc/obmc-console/build/../config.c:110:2: error: multiple declarations in a single statement reduces readability [readability-isolate-declaration,-warnings-as-errors]
        size_t size, len;
        ^~~~~~~~~~~~~~~~~
/mnt/host/andrew/home/andrew/src/openbmc/obmc-console/build/../config.c:170:2: error: multiple declarations in a single statement reduces readability [readability-isolate-declaration,-warnings-as-errors]
        struct config_item *item, *next;
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/mnt/host/andrew/home/andrew/src/openbmc/obmc-console/build/../console-client.c:263:2: error: multiple declarations in a single statement reduces readability [readability-isolate-declaration,-warnings-as-errors]
        struct console_client _client, *client;
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6 warnings generated.
```

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ia7829b1672ea2dfb3fa020c7c48bd8266e6a1769
diff --git a/socket-handler.c b/socket-handler.c
index f37dcb8..4a53a51 100644
--- a/socket-handler.c
+++ b/socket-handler.c
@@ -123,7 +123,8 @@
 static ssize_t send_all(struct client *client, void *buf, size_t len,
 			bool block)
 {
-	int fd, flags;
+	int fd;
+	int flags;
 	ssize_t rc;
 	size_t pos;
 
@@ -168,7 +169,8 @@
 {
 	uint8_t *buf;
 	ssize_t wlen;
-	size_t len, total_len;
+	size_t len;
+	size_t total_len;
 	bool block;
 
 	total_len = 0;
@@ -302,7 +304,8 @@
 {
 	struct socket_handler *sh = to_socket_handler(handler);
 	struct client *client;
-	int fd, n;
+	int fd;
+	int n;
 
 	if (!(events & POLLIN)) {
 		return POLLER_OK;