[Gnusound-common] compilation fix for gnusound 0.7 and gcc 3.4.2

[Dirk J. <do...@cu...>]

Hello developers,

this small patch fixed compilation with gcc 3.4.2. Gcc did not like the 
second label. I assume that the pthread_cleanup_pop() might have been 
some #define which resulted in nothing (on my machine) and gcc then does 
not allow labels just before a brace (the return is not a real statement 
for gcc).

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