[PATCH] Unwind information fix for the vsyscall DSO

When working on GDB support I found a typo.  I assume the comment is
correct.  If you step to this particular instruction and backtrace, GDB
gets lost.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/vsyscall-sysenter.S

@@ -84,7 +84,7 @@ SYSENTER_RETURN:
 	.byte 0x04		/* DW_CFA_advance_loc4 */
 	.long .Lpop_ebp-.Lenter_kernel
 	.byte 0x0e		/* DW_CFA_def_cfa_offset */
-	.byte 0x12		/* RA at offset 12 now */
+	.byte 0x0c		/* RA at offset 12 now */
 	.byte 0xc5		/* DW_CFA_restore %ebp */
 	.byte 0x04		/* DW_CFA_advance_loc4 */
 	.long .Lpop_edx-.Lpop_ebp