dynamic_debug: fix comment

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index dfba055..96bc6a4 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -641,7 +641,7 @@
 __setup("ddebug_query=", ddebug_setup_query);
 
 /*
- * File_ops->write method for <debugfs>/dynamic_debug/conrol.  Gathers the
+ * File_ops->write method for <debugfs>/dynamic_debug/control.  Gathers the
  * command text from userspace, parses and executes it.
  */
 #define USER_BUF_PAGE 4096