mmc: vub300: Use scnprintf() for avoiding potential buffer overflow

Since snprintf() returns the would-be-output size instead of the
actual output size, the succeeding calls may go beyond the given
buffer limit. Fix it by replacing with scnprintf().

Signed-off-by: Takashi Iwai <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/vub300.c

···
 	int retval;
 	for (n = 0; n < sdio_funcs; n++) {
 		struct sdio_func *sf = card->sdio_func[n];
-		l += snprintf(vub300->vub_name + l,
+		l += scnprintf(vub300->vub_name + l,
 			      sizeof(vub300->vub_name) - l, "_%04X%04X",
 			      sf->vendor, sf->device);
 	}