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/config.c b/config.c
index ce2ed47..5a2f4f0 100644
--- a/config.c
+++ b/config.c
@@ -59,8 +59,10 @@
 static void config_parse(struct config *config, char *buf)
 {
 	struct config_item *item;
-	char *name, *value;
-	char *p, *line;
+	char *name;
+	char *value;
+	char *p;
+	char *line;
 
 	for (p = NULL, line = strtok_r(buf, "\n", &p); line;
 	     line = strtok_r(NULL, "\n", &p)) {
@@ -102,7 +104,8 @@
 static struct config *config_init_fd(int fd, const char *filename)
 {
 	struct config *config;
-	size_t size, len;
+	size_t size;
+	size_t len;
 	ssize_t rc;
 	char *buf;
 
@@ -162,7 +165,8 @@
 
 void config_fini(struct config *config)
 {
-	struct config_item *item, *next;
+	struct config_item *item;
+	struct config_item *next;
 
 	for (item = config->items; item; item = next) {
 		next = item->next;