Hibernation: Remove unnecessary variable declaration

Remove the unnecessary extern declaration of resume_file[]
from kernel/power/swap.c .

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Len Brown <len.brown@intel.com>

kernel/power/swap.c

@@ -28,8 +28,6 @@
 
 #include "power.h"
 
-extern char resume_file[];
-
 #define SWSUSP_SIG	"S1SUSPEND"
 
 struct swsusp_header {