pg_basebackup: Correct type of WalSegSz

The pg_basebackup code had WalSegSz as uint32, whereas the rest of the
code has it as int.  This seems confusing, and using the extra range
wouldn't actually work.

Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://www.postgresql.org/message-id/flat/1bf15c7a-0acd-1864-081e-7a28814310fe%40enterprisedb.com

Author: petere

src/bin/pg_basebackup/streamutil.c

@@ -31,7 +31,7 @@
 
 #define ERRCODE_DUPLICATE_OBJECT  "42710"
 
-uint32		WalSegSz;
+int			WalSegSz;
 
 static bool RetrieveDataDirCreatePerm(PGconn *conn);
 

src/bin/pg_basebackup/streamutil.h

@@ -24,7 +24,7 @@ extern char *dbuser;
 extern char *dbport;
 extern char *dbname;
 extern int	dbgetpassword;
-extern uint32 WalSegSz;
+extern int	WalSegSz;
 
 /* Connection kept global so we can disconnect easily */
 extern PGconn *conn;