receptor: Fix wrong function type for bindlisten*()

[ignatenkobrain]

receptor.h:23:5: warning: type of 'bindlisten' does not match original declaration [-Wlto-type-mismatch]
   23 | int bindlisten(listener *lsnr, unsigned int backlog);
      |     ^
receptor.c:214:1: note: return value type mismatch
  214 | bindlisten(listener *lsnr, unsigned int backlog)
      | ^
receptor.c:214:1: note: type 'char' should match type 'int'
receptor.c:214:1: note: 'bindlisten' was previously declared here

Signed-off-by: Igor Raits igor.raits@gmail.com

[grobian]

thanks, merged!