powerpc: Remove redundant spaces to match coding style

These one line of code don't meet the kernel coding style, so remove the
redundant space.
Signed-off-by: maqiang <maqianga@uniontech.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210303115710.30886-1-maqianga@uniontech.com

arch/powerpc/kernel/syscalls.c

@@ -73,7 +73,7 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
 int
 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp)
 {
-	if ( (unsigned long)n >= 4096 )
+	if ((unsigned long)n >= 4096)
 		return sys_old_select((void __user *)n);
 
 	return sys_select(n, inp, outp, exp, tvp);