Format better code for xact_decode()'s XLOG_XACT_INVALIDATIONS

This makes the code more consistent with the surroundings.

Author: ChangAo Chen
Reviewed-by: Ashutosh Bapat
Discussion: https://postgr.es/m/CAExHW5tNTevUh58SKddTtcX3yU_5_PDSC8Mdp-Q2hc9PpZHRJg@mail.gmail.com

src/backend/replication/logical/decode.c

@@ -301,12 +301,13 @@ xact_decode(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 					ReorderBufferXidSetCatalogChanges(ctx->reorder, xid,
 													  buf->origptr);
 				}
-				else if ((!ctx->fast_forward))
+				else if (!ctx->fast_forward)
 					ReorderBufferImmediateInvalidation(ctx->reorder,
 													   invals->nmsgs,
 													   invals->msgs);
+
+				break;
 			}
-			break;
 		case XLOG_XACT_PREPARE:
 			{
 				xl_xact_parsed_prepare parsed;