Fix file descriptor value

Author: shivansh

reset/rst-sync-est-fin-wait-1.pkt

@@ -22,4 +22,4 @@
 
 // Our application writes 1000 bytes
 // This should produce a runtime error, since the connection has been reset.
-0.120 write(4, ..., 1000) = 1000
+0.120 write(3, ..., 1000) = -1

reset/rst-sync-est-fin-wait-2.pkt

@@ -25,4 +25,4 @@
 
 // Our application writes 1000 bytes
 // This should produce a runtime error, since the connection has been reset.
-0.120 write(4, ..., 1000) = 1000
+0.120 write(3, ..., 1000) = -1

reset/rst-sync-est-time-wait.pkt

@@ -34,4 +34,4 @@
 
 // Our application writes 1000 bytes
 // This should produce a runtime error, since the connection has been reset.
-0.130 write(4, ..., 1000) = 1000
+0.130 write(3, ..., 1000) = -1