Free walmethods before exiting

Not strictly necessary since we quite after, but could become important
in the future if we do restarts etc.

Michael Paquier with nitpicking from me

src/bin/pg_basebackup/pg_basebackup.c

@@ -495,6 +495,13 @@ LogStreamerMain(logstreamer_param *param)
 	}
 
 	PQfinish(param->bgconn);
+
+	if (format == 'p')
+		FreeWalDirectoryMethod();
+	else
+		FreeWalTarMethod();
+	pg_free(stream.walmethod);
+
 	return 0;
 }
 

src/bin/pg_basebackup/pg_receivexlog.c

@@ -352,6 +352,10 @@ StreamLog(void)
 	}
 
 	PQfinish(conn);
+
+	FreeWalDirectoryMethod();
+	pg_free(stream.walmethod);
+
 	conn = NULL;
 }
 

src/bin/pg_basebackup/walmethods.c

@@ -299,6 +299,13 @@ CreateWalDirectoryMethod(const char *basedir, bool sync)
 	return method;
 }
 
+void
+FreeWalDirectoryMethod(void)
+{
+	pg_free(dir_data->basedir);
+	pg_free(dir_data);
+}
+
 
 /*-------------------------------------------------------------------------
  * WalTarMethod - write wal to a tar file containing pg_xlog contents
@@ -894,3 +901,14 @@ CreateWalTarMethod(const char *tarbase, int compression, bool sync)
 
 	return method;
 }
+
+void
+FreeWalTarMethod(void)
+{
+	pg_free(tar_data->tarfilename);
+#ifdef HAVE_LIBZ
+	if (tar_data->compression)
+		 pg_free(tar_data->zlibOut);
+#endif
+	pg_free(tar_data);
+}

src/bin/pg_basebackup/walmethods.h

@@ -43,3 +43,7 @@ struct WalWriteMethod
  */
 WalWriteMethod *CreateWalDirectoryMethod(const char *basedir, bool sync);
 WalWriteMethod *CreateWalTarMethod(const char *tarbase, int compression, bool sync);
+
+/* Cleanup routines for previously-created methods */
+void FreeWalDirectoryMethod(void);
+void FreeWalTarMethod(void);