[RFC PATCH 05/18] powerpc/boot: add PROM_ERROR define in oflib

[Cédric Le Goater]

This is mostly useful to make to the boot wrapper code closer with
the kernel code in prom_init.

Signed-off-by: Cédric Le Goater <clg at fr.ibm.com>
---
 arch/powerpc/boot/oflib.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/boot/oflib.c b/arch/powerpc/boot/oflib.c
index 0f72b1a42133..96fe4d225abe 100644
--- a/arch/powerpc/boot/oflib.c
+++ b/arch/powerpc/boot/oflib.c
@@ -27,6 +27,8 @@ struct prom_args {
 	__be32 args[10];	/* Input/output arguments. */
 };
 
+#define PROM_ERROR (-1u)
+
 static int (*prom) (void *);
 
 void of_init(void *promptr)
@@ -55,7 +57,7 @@ int of_call_prom(const char *service, int nargs, int nret, ...)
 		args.args[nargs+i] = 0;
 
 	if (prom(&args) < 0)
-		return -1;
+		return PROM_ERROR;
 
 	return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
 }
@@ -80,9 +82,9 @@ static int of_call_prom_ret(const char *service, int nargs, int nret,
 		args.args[nargs+i] = 0;
 
 	if (prom(&args) < 0)
-		return -1;
+		return PROM_ERROR;
 
-	if (rets != (void *) 0)
+	if (rets != NULL)
 		for (i = 1; i < nret; ++i)
 			rets[i-1] = be32_to_cpu(args.args[nargs+i]);
 
-- 
1.7.10.4