x86/lib: Fix indentation issue, remove extra tab

The increment of buff is indented one level too deeply, clean
this up by removing a tab.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: kernel-janitors@vger.kernel.org
Link: https://lkml.kernel.org/r/20190314230838.18256-1-colin.king@canonical.com

arch/x86/lib/csum-partial_64.c

@@ -94,7 +94,7 @@ static unsigned do_csum(const unsigned char *buff, unsigned len)
 				    : "m" (*(unsigned long *)buff), 
 				    "r" (zero),  "0" (result));
 				--count; 
-					buff += 8;
+				buff += 8;
 			}
 			result = add32_with_carry(result>>32,
 						  result&0xffffffff);