Attempt #2 to fix PB failures introduced by the patch for bug #44796.

Since max_allowed_packet is a read-only variable in 5.1 and up,
disable warnings to avoid unnecessary test case complication.

mysql-test/r/func_compress.result

@@ -116,8 +116,6 @@ Warnings:
 Error	1259	ZLIB: Input data corrupted
 Error	1259	ZLIB: Input data corrupted
 drop table t1;
-SET @old_max_allowed_packet = @@max_allowed_packet;
-SET @@max_allowed_packet = 1024 * 1024;
 CREATE TABLE t1 (c1 INT);
 INSERT INTO t1 VALUES (1), (1111), (11111);
 SELECT UNCOMPRESS(c1), UNCOMPRESSED_LENGTH(c1) FROM t1;
@@ -125,13 +123,6 @@ UNCOMPRESS(c1)	UNCOMPRESSED_LENGTH(c1)
 NULL	NULL
 NULL	NULL
 NULL	825307441
-Warnings:
-Error	1259	ZLIB: Input data corrupted
-Error	1259	ZLIB: Input data corrupted
-Error	1259	ZLIB: Input data corrupted
-Error	1259	ZLIB: Input data corrupted
-Error	1256	Uncompressed data size too large; the maximum size is 1048576 (probably, length of uncompressed data was corrupted)
 EXPLAIN EXTENDED SELECT * FROM (SELECT UNCOMPRESSED_LENGTH(c1) FROM t1) AS s;
-SET @@max_allowed_packet = @old_max_allowed_packet;
 DROP TABLE t1;
 End of 5.0 tests

mysql-test/t/func_compress.test

@@ -87,21 +87,19 @@ drop table t1;
 #             uncompressed_length
 #
 
-SET @old_max_allowed_packet = @@max_allowed_packet;
-SET @@max_allowed_packet = 1024 * 1024;
-
 CREATE TABLE t1 (c1 INT);
 INSERT INTO t1 VALUES (1), (1111), (11111);
 
+# Disable warnings to avoid dependency on max_allowed_packet value
+--disable_warnings
 SELECT UNCOMPRESS(c1), UNCOMPRESSED_LENGTH(c1) FROM t1;
+--enable_warnings
 
 # We do not need the results, just make sure there are no valgrind errors
 --disable_result_log
 EXPLAIN EXTENDED SELECT * FROM (SELECT UNCOMPRESSED_LENGTH(c1) FROM t1) AS s;
 --enable_result_log
 
-SET @@max_allowed_packet = @old_max_allowed_packet;
-
 DROP TABLE t1;
 
 --echo End of 5.0 tests