[fetchmail]ssl socket close

I was testing the idle option for fetchmail. When the server
disconnected after half an hour, fetchmail went in an infinite loop.
ltrace showed that it was doing:

SSL_peek() = 0
ERR_get_error () = 0
SSL_read() = 0

in an infinite loop. This patch should fix the infinite loop:

============================================================================
diff -Naur fetchmail-5.9.6.orig/socket.c fetchmail-5.9.6/socket.c
--- fetchmail-5.9.6.orig/socket.c       Thu Nov  8 23:43:45 2001
+++ fetchmail-5.9.6/socket.c    Thu Jan  3 11:33:24 2002
@@ -581,7 +581,7 @@
                        newline = NULL;
                } else if ((newline = memchr(bp, '\n', n)) != NULL)
                        n = newline - bp + 1;
-               if ((n = SSL_read(ssl, bp, n)) == -1) {
+               if ((n = SSL_read(ssl, bp, n)) <= 0) {
                        return(-1);
                }
                /* Check for case where our single character turned out to
============================================================================

Sunil Shetye.