powerpc: Add missing calls to va_end()

cppcheck picked up that there were a couple of missing va_end()
calls in functions using va_start().

Signed-off-by: Daniel Axtens <[e-mail]>
Reviewed-by: Russell Currey <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/kernel/prom_init.c

···
 			break;
 		}
 	}
+	va_end(args);
 }
 
 

arch/powerpc/platforms/powermac/bootx_init.c

···
 			break;
 		}
 	}
+	va_end(args);
 }
 #else /* CONFIG_BOOTX_TEXT */
 static void __init bootx_printf(const char *format, ...) {}