target: declare local symbols as static

Functions and variables that are not used outside the file should
be declared as static.

Change-Id: I9f97571a528f0cb3c3c26f873577ab16fdec3cdc
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5895
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/target/openrisc/jsp_server.c

@@ -57,7 +57,7 @@ static int telnet_write(struct connection *connection, const void *data, int len
 	return ERROR_SERVER_REMOTE_CLOSED;
 }
 
-int jsp_poll_read(void *priv)
+static int jsp_poll_read(void *priv)
 {
 	struct jsp_service *jsp_service = (struct jsp_service *)priv;
 	unsigned char out_buffer[10];