[POWERPC] Fix arch/powerpc/platforms/powermac/pic.c when !CONFIG_ADB_PMU

When building arch/powerpc/platforms/powermac/pic.c when !CONFIG_ADB_PMU
we get the following warnings:

arch/powerpc/platforms/powermac/pic.c: In function 'pmacpic_find_viaint':
arch/powerpc/platforms/powermac/pic.c:623: warning: label 'not_found' defined but not used

This fixes it.
Signed-off-by: NTony Breeds <tony@bakeyournoodle.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/platforms/powermac/pic.c

@@ -618,9 +618,9 @@ static int pmacpic_find_viaint(void)
 	if (np == NULL)
 		goto not_found;
 	viaint = irq_of_parse_and_map(np, 0);;
-#endif /* CONFIG_ADB_PMU */
 
 not_found:
+#endif /* CONFIG_ADB_PMU */
 	return viaint;
 }