The local variable 'rotate' is not used on s390, and building the kernel
with W=1 generates the following warning:

init/do_mounts_rd.c:192:17: warning: variable 'rotate' set but not used [-Wunused-but-set-variable]
  192 |         unsigned short rotate = 0;
      |                        ^
1 warning generated.

Fix this by declaring and using 'rotate' only when CONFIG_S390 is not
defined.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
 init/do_mounts_rd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index ac021ae6e6fa..cbc4c496cb5f 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -189,9 +189,9 @@ int __init rd_load_image(char *from)
 	unsigned long rd_blocks, devblocks;
 	int nblocks, i;
 	char *buf = NULL;
-	unsigned short rotate = 0;
 	decompress_fn decompressor = NULL;
 #if !defined(CONFIG_S390)
+	unsigned short rotate = 0;
 	char rotator[4] = { '|' , '/' , '-' , '\\' };
 #endif
 
@@ -249,7 +249,9 @@ int __init rd_load_image(char *from)
 	for (i = 0; i < nblocks; i++) {
 		if (i && (i % devblocks == 0)) {
 			pr_cont("done disk #1.\n");
+#if !defined(CONFIG_S390)
 			rotate = 0;
+#endif
 			fput(in_file);
 			break;
 		}
-- 
2.51.0