powerpc/64s: restore_math remove TM test

The TM test in restore_math added by commit dc16b553 ("powerpc:
Always restore FPU/VEC/VSX if hardware transactional memory in use") is
no longer necessary after commit a8318c13 ("powerpc/tm: Fix
restoring FP/VMX facility incorrectly on interrupts"), which removed
the cases where restore_math has to restore if TM is active.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200623234139.2262227-1-npiggin@gmail.com

arch/powerpc/kernel/process.c

@@ -530,8 +530,7 @@ void notrace restore_math(struct pt_regs *regs)
 {
 	unsigned long msr;
 
-	if (!MSR_TM_ACTIVE(regs->msr) &&
-		!current->thread.load_fp && !loadvec(current->thread))
+	if (!current->thread.load_fp && !loadvec(current->thread))
 		return;
 
 	msr = regs->msr;