syscall: Drop unneeded addr variable

Otherwise it become a global variable propagated
even to files where it must has no reference to
(such as parasite code)

Symbol table '.symtab' contains 22 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
...
     4: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS parasite.c
...
    21: 000000000000b208     8 OBJECT  GLOBAL DEFAULT    3 addr
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

include/syscall.h

@@ -354,7 +354,7 @@ static int sys_socket(int domain, int type, int protocol)
 	return syscall3(__NR_socket, (long) domain, (long) type, (long) protocol);
 }
 
-struct sockaddr *addr;
+struct sockaddr;
 static int sys_bind(int sockfd, const struct sockaddr *addr, int addrlen)
 {
 	return syscall3(__NR_bind, (long)sockfd, (long)addr, (long) addrlen);