Use dynamically-sized selected[] array for -P PATH

While at it, added a small optimization of not remembering
the path twice if it happens to be the same.

   text	   data	    bss	    dec	    hex	filename
 245111	    680	  10860	 256651	  3ea8b	strace_old
 245075	    680	   9804	 255559	  3e647	strace

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/defs.h b/defs.h
index 6bfa916..1d607c7 100644
--- a/defs.h
+++ b/defs.h
@@ -601,7 +601,7 @@ extern int clearbpt(struct tcb *);
 
 extern const char *signame(int);
 extern int is_restart_error(struct tcb *);
-extern int pathtrace_select(const char *);
+extern void pathtrace_select(const char *);
 extern int pathtrace_match(struct tcb *);
 extern const char *getfdpath(struct tcb *, int);