toshiba.h: hide a function prototypes behind __KERNEL__ macro

Currently, tosh_smm() prototype is present in a header file exported to
userland. This patch fixes it.

Signed-off-by: Alexander Shishkin <[e-mail]>
Cc: Jonathan Buzzard <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/toshiba.h

···
 	unsigned int edi __attribute__ ((packed));
 } SMMRegisters;
 
+#ifdef __KERNEL__
 int tosh_smm(SMMRegisters *regs);
+#endif /* __KERNEL__ */
 
 #endif