[PATCH] powerpc/powernv: Fix no return statement issue in __opal_call_trace()

Commit 75d9fc7fd94e ("powerpc/powernv: move OPAL call wrapper tracing and
interrupt handling to C") adds the function:

static s64 __opal_call_trace(s64 a0, s64 a1, s64 a2, s64 a3,
			     s64 a4, s64 a5, s64 a6, s64 a7,
			      unsigned long opcode, unsigned long msr)
{
}

However, that causes the following compilation error:

$ make skiroot_defconfig
$ make -j$(nproc)
...
arch/powerpc/platforms/powernv/opal-call.c: In function
‘__opal_call_trace’:
arch/powerpc/platforms/powernv/opal-call.c:89:1: error: no return
statement in function returning non-void [-Werror=return-type]

This patch fixes the issue by returning zero as suggested by the author
of the commit.

Fixes: 75d9fc7fd94e ("powerpc/powernv: move OPAL call wrapper tracing and interrupt handling to C")
Signed-off-by: Claudio Carvalho <redacted>
CC: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/platforms/powernv/opal-call.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/platforms/powernv/opal-call.c b/arch/powerpc/platforms/powernv/opal-call.c
index 578757d..daad8c4 100644
--- a/arch/powerpc/platforms/powernv/opal-call.c
+++ b/arch/powerpc/platforms/powernv/opal-call.c

@@ -86,6 +86,7 @@ static s64 __opal_call_trace(s64 a0, s64 a1, s64 a2, s64 a3,
 			     s64 a4, s64 a5, s64 a6, s64 a7,
 			      unsigned long opcode, unsigned long msr)
 {
+	return 0;
 }
 
 #define DO_TRACE false

-- 
2.7.4