UBI: use pr_ helper instead of printk

Use 'pr_err()' instead of 'printk(KERN_ERR', etc.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
diff --git a/drivers/mtd/ubi/debug.h b/drivers/mtd/ubi/debug.h
index d9e89ec..ea4cb7c 100644
--- a/drivers/mtd/ubi/debug.h
+++ b/drivers/mtd/ubi/debug.h
@@ -29,13 +29,13 @@
 
 #define ubi_assert(expr)  do {                                               \
 	if (unlikely(!(expr))) {                                             \
-		printk(KERN_CRIT "UBI assert failed in %s at %u (pid %d)\n", \
+		pr_crit("UBI assert failed in %s at %u (pid %d)\n",          \
 		       __func__, __LINE__, current->pid);                    \
 		dump_stack();                                                \
 	}                                                                    \
 } while (0)
 
-#define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a)  \
+#define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a)                   \
 		print_hex_dump(l, ps, pt, r, g, b, len, a)
 
 #define ubi_dbg_msg(type, fmt, ...) \
@@ -43,8 +43,8 @@
 		 ##__VA_ARGS__)
 
 /* Just a debugging messages not related to any specific UBI subsystem */
-#define dbg_msg(fmt, ...)                                    \
-	printk(KERN_DEBUG "UBI DBG (pid %d): %s: " fmt "\n", \
+#define dbg_msg(fmt, ...)                                                    \
+	pr_err("UBI DBG (pid %d): %s: " fmt "\n",                            \
 	       current->pid, __func__, ##__VA_ARGS__)
 
 /* General debugging messages */