Fix whitespace issues

We don't usually put space before in-place increment or decrement. Let's
make code look similar to other Osmocom projects.

Change-Id: I5962431ad16c97e412939dc1b8949f6361a5c26e
diff --git a/src/libcommon/oap_client.c b/src/libcommon/oap_client.c
index 39055ab..7154baa 100644
--- a/src/libcommon/oap_client.c
+++ b/src/libcommon/oap_client.c
@@ -257,7 +257,7 @@
 		     "OAP registration failed\n");
 		state->state = OAP_INITIALIZED;
 		if (state->registration_failures < 3) {
-			state->registration_failures ++;
+			state->registration_failures++;
 			return oap_client_register(state, msg_tx);
 		}
 		return -11;