powerpc: Use bool function return values of true/false not 1/0

Use the normal return values for bool functions

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/sysdev/dcr.c b/arch/powerpc/sysdev/dcr.c
index 2d8a101..121e26f 100644
--- a/arch/powerpc/sysdev/dcr.c
+++ b/arch/powerpc/sysdev/dcr.c
@@ -54,7 +54,7 @@
 	else if (host.type == DCR_HOST_MMIO)
 		return dcr_map_ok_mmio(host.host.mmio);
 	else
-		return 0;
+		return false;
 }
 EXPORT_SYMBOL_GPL(dcr_map_ok_generic);