MIPS: O32/32-bit: Remove outdated comment

A comment in the O32/32-bit system call code is incorrect since commit
46e12c07 ("MIPS: O32 / 32-bit: Always copy 4 stack arguments.").
Remove it.
Signed-off-by: Alex Smith <alex@alex-smith.me.uk>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7455/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/scall32-o32.S

@@ -67,8 +67,6 @@ NESTED(handle_sys, PT_SIZE, sp)
 
 	/*
 	 * Ok, copy the args from the luser stack to the kernel stack.
-	 * t3 is the precomputed number of instruction bytes needed to
-	 * load or store arguments 6-8.
 	 */
 
 	.set    push