testsuite: recvmsg.c don't use unitialized bytes.

valgrind flags the buffer as containing random bytes when the read call
fails.

diff --git a/testsuite/systemtap.syscall/recvmsg.c b/testsuite/systemtap.syscall/recvmsg.c
index d1ac461843df0104d0916a52238263c801faa869..96d63fa5236c77acd2cb7c11fadb686d23793367 100644 (file)
--- a/testsuite/systemtap.syscall/recvmsg.c
+++ b/testsuite/systemtap.syscall/recvmsg.c
@@ -87,7 +87,7 @@ void do_child()
                char rbuf[1024];
 
                cc = read(fd, rbuf, sizeof(rbuf));
-               if (cc && rbuf[0] == 'R')
+               if (cc > 0 && rbuf[0] == 'R')
                    sender(fd);
                if (cc == 0 || (cc < 0 && errno != EINTR)) {
                    (void)close(fd);