[PATCH, boehm-gc]: Fix a couple of testcases

[Uros Bizjak]

Hello!

As shown in [1], missing return statement in main function triggers a
spurious test failure on alphaev68-pc-linux-gnu.

Attached patch adds missing declarations and return statements where
applicable.

2010-05-13  Uros Bizjak  <ubizjak@gmail.com>

	* tests/leak_test.c (main): Declare as int.  Return 0.
	* tests/thread_leak_test.c (main): Ditto.
	* tests/trace_test.c (main): Ditto.

Tested (only leak test) on alphaev68-pc-linux-gnu.

Patch was committed to SVN gcc under obvious rule.

[1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42811#c16

Uros.
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