perf probe: Fix get_real_path to free allocated memory in error path

Fix get_real_path to free allocated memory when comp_dir is used for
complementing path and getting an error.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naohiro Aota <naota@elisp.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150226082504.28125.74506.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/probe-event.c

@@ -549,9 +549,11 @@ static int get_real_path(const char *raw_path, const char *comp_dir,
 		if (access(*new_path, R_OK) == 0)
 			return 0;
 
-		if (!symbol_conf.source_prefix)
+		if (!symbol_conf.source_prefix) {
 			/* In case of searching comp_dir, don't retry */
+			zfree(new_path);
 			return -errno;
+		}
 
 		switch (errno) {
 		case ENAMETOOLONG: