nfsd: fix memory overflow for haddr

when hcounter is not 0, haddr memory is not enough.
asan report heap-buffer-overflow error in following scene:
CFLAGS="-fsanitize=address -g" ./configure && make
./utils/nfsd/nfsd -H 192.168.1.1 -H 192.168.1.2

Signed-off-by: zhangjian <[email protected]>
---
 utils/nfsd/nfsd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/utils/nfsd/nfsd.c b/utils/nfsd/nfsd.c
index c95d32f4..e3fcdde4 100644
--- a/utils/nfsd/nfsd.c
+++ b/utils/nfsd/nfsd.c
@@ -185,7 +185,7 @@ main(int argc, char **argv)
 				hcounter = 0;
 			}
 			if (hcounter) {
-				haddr = realloc(haddr, sizeof(char*) * hcounter+1);
+				haddr = realloc(haddr, sizeof(char*) * (hcounter+1));
 				if(!haddr) {
 					fprintf(stderr, "%s: unable to allocate "
 							"memory.\n", progname);
-- 
2.33.0