[PATCH] trace-cmd: Fix a warning about incompatible pointer type of load_plugin()

[Taeung Song]

Currently the return type of load_plugin() in plugin_python.c is void type,
but it is different from the argument type of trace_util_load_plugins().
So fix it for the below warning.

  /home/taeung/git/opensource/trace-cmd/plugin_python.c: In function 
‘pevent_plugin_loader’:
  /home/taeung/git/opensource/trace-cmd/plugin_python.c:95:41: warning: passing 
argument 3 of ‘trace_util_load_plugins’ from incompatible pointer type 
[-Wincompatible-pointer-types]
    trace_util_load_plugins(pevent, ".py", load_plugin, globals);
                                         ^
  In file included from 
/home/taeung/git/opensource/trace-cmd/plugin_python.c:3:0:
  /home/taeung/git/opensource/trace-cmd/trace-cmd.h:300:5: note: expected ‘int 
(*)(struct pevent *, const char *, const char *, void *)’ but argument is of 
type ‘void (*)(struct pevent *,   const char *, const char *, void *)’
   int trace_util_load_plugins(struct pevent *pevent, const char *suffix,
     ^

Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 plugin_python.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/plugin_python.c b/plugin_python.c
index da07d27..d736f50 100644
--- a/plugin_python.c
+++ b/plugin_python.c
@@ -20,7 +20,7 @@ static const char pyload[] =
 "finally:\n"
 "   file.close()\n";
 
-static void load_plugin(struct pevent *pevent, const char *path,
+static int load_plugin(struct pevent *pevent, const char *path,
                        const char *name, void *data)
 {
        PyObject *globals = data;
@@ -32,7 +32,7 @@ static void load_plugin(struct pevent *pevent, const char 
*path,
        PyObject *res;
 
        if (!full || !n)
-               return;
+               return -ENOMEM;
 
        strcpy(full, path);
        strcat(full, "/");
@@ -43,16 +43,18 @@ static void load_plugin(struct pevent *pevent, const char 
*path,
 
        asprintf(&load, pyload, full, n);
        if (!load)
-               return;
+               return -1;
 
        res = PyRun_String(load, Py_file_input, globals, globals);
        if (!res) {
                fprintf(stderr, "failed loading %s\n", full);
                PyErr_Print();
+               return -1;
        } else
                Py_DECREF(res);
 
        free(load);
+       return 0;
 }
 
 int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
-- 
2.7.4