[PATCH] powerpc/fsl: fix compiler warning in fsl_wakeup_sys_init()

[Greg Kroah-Hartman]

Commit c93bd175414a ("powerpc/fsl: move to use bus_get_dev_root()")
changed to use bus_get_dev_root() but didn't consider that the function
can fail and return an uninitialized value of ret (hint, the function
can never fail, but the compiler doesn't know that.)

Fix this up by setting ret to -EINVAL just in case something really goes
wrong with the call to bus_get_dev_root().

Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Fixes: c93bd175414a ("powerpc/fsl: move to use bus_get_dev_root()")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: https://lore.kernel.org/oe-kbuild-all/202303280045.4oaaezcn-lkp@xxxxxxxxx/
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c b/arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c
index 147b5d8bb904..ce6c739c51e5 100644
--- a/arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c
+++ b/arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c
@@ -117,7 +117,7 @@ static struct device_attribute mpic_attributes = __ATTR(timer_wakeup, 0644,
 static int __init fsl_wakeup_sys_init(void)
 {
 	struct device *dev_root;
-	int ret;
+	int ret = -EINVAL;
 
 	fsl_wakeup = kzalloc(sizeof(struct fsl_mpic_timer_wakeup), GFP_KERNEL);
 	if (!fsl_wakeup)
-- 
2.40.0