sparc: fix some 64bit intolerant code

Change-Id: I90bea483d7cf18696a6d5d2f18e8cada409884a2
Reviewed-on: https://review.haiku-os.org/c/1325
Reviewed-by: Alex von Gluck IV <[email protected]>

src/system/boot/platform/openfirmware/devices.cpp

@@ -205,7 +205,7 @@ platform_add_block_devices(stage2_args *args, NodeList *devicesList)
 
 		printf("\t%s\n", path);
 
-		int handle = of_open(path);
+		intptr_t handle = of_open(path);
 		if (handle == OF_FAILED) {
 			puts("\t\t(failed)");
 			continue;

src/system/boot/platform/openfirmware/start.cpp

@@ -116,7 +116,7 @@ platform_start_kernel(void)
 
 	status_t error = arch_start_kernel(&gKernelArgs, kernelEntry, stackTop);
 
-	panic("Kernel returned! Return value: %ld\n", error);
+	panic("Kernel returned! Return value: %" B_PRId32 "\n", error);
 }