[PATCH 4.18 065/123] lib/vsprintf: Do not handle %pO[^F] as %px

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@xxxxxxx>

commit 554ec508653688c21d9b8024af73a1ffaa0164b9 upstream.

This patch avoids that gcc reports the following when building with W=1:

lib/vsprintf.c:1941:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   switch (fmt[1]) {
   ^~~~~~

Fixes: 7b1924a1d930eb2 ("vsprintf: add printk specifier %px")
Link: http://lkml.kernel.org/r/20180806223421.11995-1-bart.vanassche@xxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: Bart Van Assche <bart.vanassche@xxxxxxx>
Cc: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: v4.15+ <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx>
Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 lib/vsprintf.c |    1 +
 1 file changed, 1 insertion(+)

--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1942,6 +1942,7 @@ char *pointer(const char *fmt, char *buf
 		case 'F':
 			return device_node_string(buf, end, ptr, spec, fmt + 1);
 		}
+		break;
 	case 'x':
 		return pointer_string(buf, end, ptr, spec);
 	}