patch to fix short-option for certfile (-F) in nbd-client

[Matt Panaro <matt.panaro@gmail.com>]

--- a/nbd-client.c
+++ b/nbd-client.c
@@ -897,9 +900,9 @@ void disconnect(char* device) {
 }
 
 #if HAVE_NETLINK
-static const char *short_opts = "-A:B:b:c:C:d:gH:hK:LlnN:PpRSst:uVx";
+static const char *short_opts = "-A:B:b:c:C:d:F:gH:hK:LlnN:PpRSst:uVx";
 #else
-static const char *short_opts = "-A:B:b:c:C:d:gH:hK:lnN:PpRSst:uVx";
+static const char *short_opts = "-A:B:b:c:C:d:F:gH:hK:lnN:PpRSst:uVx";
 #endif
 
 int main(int argc, char *argv[]) {