Replace _PPC64_SERIAL_H with _ASM_POWERPC_SERIAL_H to match the actual
macro name. Remove an empty comment while at it.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
 arch/powerpc/include/asm/serial.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/serial.h b/arch/powerpc/include/asm/serial.h
index cd6c18d0e66e..c3eb4a64b3f5 100644
--- a/arch/powerpc/include/asm/serial.h
+++ b/arch/powerpc/include/asm/serial.h

@@ -1,6 +1,4 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- */
 #ifndef _ASM_POWERPC_SERIAL_H
 #define _ASM_POWERPC_SERIAL_H
 

@@ -18,4 +16,4 @@ extern void find_legacy_serial_ports(void);
 #define find_legacy_serial_ports()	do { } while (0)
 #endif
 
-#endif /* _PPC64_SERIAL_H */
+#endif /* _ASM_POWERPC_SERIAL_H */