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

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

From: Bart Van Assche <[email protected]>

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/[email protected]
Cc: [email protected]
Cc: Bart Van Assche <[email protected]>
Cc: Pantelis Antoniou <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: v4.15+ <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 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);
        }


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