i2c: stub: remove definition of DEBUG

Defining DEBUG should only be done in development.
So remove DEBUG.

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/i2c-stub.c

@@ -7,7 +7,6 @@
 
 */
 
-#define DEBUG 1
 #define pr_fmt(fmt) "i2c-stub: " fmt
 
 #include <linux/errno.h>