[media] s5p_mfc: don't use an external symbol called 'debug'

The 'debug' name is known to cause conflicts with allyesconfig
on several archs. So, localize its name.

>> drivers/built-in.o:(.bss+0xc7ee2c): multiple definition of `debug'
arch/x86/built-in.o:(.entry.text+0xf78): first defined here
ld: Warning: size of symbol `debug' changed from 86 in arch/x86/built-in.o to 4 in drivers/built-in.o

While here, fix a wrong file name reference

Reported-by: kbuild test robot <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/s5p-mfc/s5p_mfc.c

···
 #define S5P_MFC_DEC_NAME	"s5p-mfc-dec"
 #define S5P_MFC_ENC_NAME	"s5p-mfc-enc"
 
-int debug;
-module_param(debug, int, S_IRUGO | S_IWUSR);
+int mfc_debug_level;
+module_param_named(debug, mfc_debug_level, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(debug, "Debug level - higher value produces more verbose messages");
 
 /* Helper functions for interrupt processing */

drivers/media/platform/s5p-mfc/s5p_mfc_debug.h

···
 /*
- * drivers/media/platform/samsung/mfc5/s5p_mfc_debug.h
+ * drivers/media/platform/s5p-mfc/s5p_mfc_debug.h
  *
  * Header file for Samsung MFC (Multi Function Codec - FIMV) driver
  * This file contains debug macros
···
 #define DEBUG
 
 #ifdef DEBUG
-extern int debug;
+extern int mfc_debug_level;
 
 #define mfc_debug(level, fmt, args...)				\
 	do {							\
-		if (debug >= level)				\
+		if (mfc_debug_level >= level)			\
 			printk(KERN_DEBUG "%s:%d: " fmt,	\
 				__func__, __LINE__, ##args);	\
 	} while (0)