net/rds: zero last byte for strncpy

for NUL terminated string, need be always sure '\0' in the end.

additional info:
strncpy will pads with zeroes to the end of the given buffer.
should initialise every bit of memory that is going to be copied to userland

Signed-off-by: Chen Gang <[e-mail]>
Signed-off-by: Ben Hutchings <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/rds/stats.c

···
 	for (i = 0; i < nr; i++) {
 		BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
 		strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
+		ctr.name[sizeof(ctr.name) - 1] = '\0';
 		ctr.value = values[i];
 
 		rds_info_copy(iter, &ctr, sizeof(ctr));