Fix some indentation (#750)

There are lots of mixed tabs and spaces, most of them look OK if tabs are 8
characters wide, but this bit seems to have been written by someone whose editor
thinks they're 4 characters wide, so it looks all messed up.

src/iperf_client_api.c

@@ -346,22 +346,22 @@ iperf_connect(struct iperf_test *test)
     socklen_t len;
 
     len = sizeof(opt);
-	if (getsockopt(test->ctrl_sck, IPPROTO_TCP, TCP_MAXSEG, &opt, &len) < 0) {
-		test->ctrl_sck_mss = 0;
-	}
-	else {
-		if (opt > 0 && opt <= MAX_UDP_BLOCKSIZE) {
-			test->ctrl_sck_mss = opt;
-		}
-		else {
-			char str[128];
-			snprintf(str, sizeof(str),
-				"Ignoring nonsense TCP MSS %d", opt);
-			warning(str);
+    if (getsockopt(test->ctrl_sck, IPPROTO_TCP, TCP_MAXSEG, &opt, &len) < 0) {
+        test->ctrl_sck_mss = 0;
+    }
+    else {
+        if (opt > 0 && opt <= MAX_UDP_BLOCKSIZE) {
+            test->ctrl_sck_mss = opt;
+        }
+        else {
+            char str[128];
+            snprintf(str, sizeof(str),
+                     "Ignoring nonsense TCP MSS %d", opt);
+            warning(str);
 
-			test->ctrl_sck_mss = 0;
-		}
-	}
+            test->ctrl_sck_mss = 0;
+        }
+    }
 
     if (test->verbose) {
 	printf("Control connection MSS %d\n", test->ctrl_sck_mss);