Previous patch had no detectable virtue other than being a one-liner.

Try to make the code look self-consistent again, so it doesn't confuse
future developers.

src/backend/postmaster/postmaster.c

@@ -1956,6 +1956,8 @@ canAcceptConnections(void)
 
 /*
  * ConnCreate -- create a local connection data structure
+ *
+ * Returns NULL on failure, other than out-of-memory which is fatal.
  */
 static Port *
 ConnCreate(int serverFd)
@@ -1977,8 +1979,7 @@ ConnCreate(int serverFd)
 		ConnFree(port);
 		return NULL;
 	}
-	else
-	{
+
 	/*
 	 * Precompute password salt values to use for this connection. It's
 	 * slightly annoying to do this long in advance of knowing whether
@@ -1987,7 +1988,6 @@ ConnCreate(int serverFd)
 	 * advanced, and all backends would end up using the same salt...
 	 */
 	RandomSalt(port->md5Salt);
-	}
 
 	/*
 	 * Allocate GSSAPI specific state struct