check: don't use uninitialized variables

CID 154853 (#1 of 1): Uninitialized scalar variable (UNINIT)
7. uninit_use_in_call: Using uninitialized value c when calling write.

Reported-by: coverity
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-check.c

@@ -536,7 +536,7 @@ static pid_t fork_and_ptrace_attach(int (*child_setup)(void))
 {
 	pid_t pid;
 	int sk_pair[2], sk;
-	char c;
+	char c = 0;
 
 	if (socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair)) {
 		pr_perror("socketpair");