nvme: don't always build constants.o

The entire content of constants.c if guarded by an ifdef, so switch to
just building the file conditionally instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/nvme/host/Makefile

@@ -10,7 +10,8 @@ obj-$(CONFIG_NVME_FC)			+= nvme-fc.o
 obj-$(CONFIG_NVME_TCP)			+= nvme-tcp.o
 obj-$(CONFIG_NVME_APPLE)		+= nvme-apple.o
 
-nvme-core-y				:= core.o ioctl.o constants.o
+nvme-core-y				+= core.o ioctl.o
+nvme-core-$(CONFIG_NVME_VERBOSE_ERRORS)	+= constants.o
 nvme-core-$(CONFIG_TRACING)		+= trace.o
 nvme-core-$(CONFIG_NVME_MULTIPATH)	+= multipath.o
 nvme-core-$(CONFIG_BLK_DEV_ZONED)	+= zns.o

drivers/nvme/host/constants.c

@@ -6,7 +6,6 @@
 
 #include "nvme.h"
 
-#ifdef CONFIG_NVME_VERBOSE_ERRORS
 static const char * const nvme_ops[] = {
 	[nvme_cmd_flush] = "Flush",
 	[nvme_cmd_write] = "Write",
@@ -185,4 +184,3 @@ const unsigned char *nvme_get_admin_opcode_str(u8 opcode)
 		return nvme_admin_ops[opcode];
 	return "Unknown";
 }
-#endif /* CONFIG_NVME_VERBOSE_ERRORS */