perf tools: Introduce zfree

For the frequent idiom of:

   free(ptr);
   ptr = NULL;

Make it expect a pointer to the pointer being freed, so that it becomes
clear at first sight that the variable being freed is being modified.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-pfw02ezuab37kha18wlut7ir@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 4 insertions, 8 deletions

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 27ab7b59dbf4..a78721d14694 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -185,8 +185,7 @@ static int lock__parse(struct ins_operands *ops)
         return 0;
 
 out_free_ops:
-        free(ops->locked.ops);
-        ops->locked.ops = NULL;
+        zfree(&ops->locked.ops);
         return 0;
 }
 
@@ -256,8 +255,7 @@ static int mov__parse(struct ins_operands *ops)
         return 0;
 
 out_free_source:
-        free(ops->source.raw);
-        ops->source.raw = NULL;
+        zfree(&ops->source.raw);
         return -1;
 }
 
@@ -560,8 +558,7 @@ static int disasm_line__parse(char *line, char **namep, char **rawp)
         return 0;
 
 out_free_name:
-        free(*namep);
-        *namep = NULL;
+        zfree(namep);
         return -1;
 }
 
@@ -1113,8 +1110,7 @@ static void symbol__free_source_line(struct symbol *sym, int len)
                 src_line = (void *)src_line + sizeof_src_line;
         }
 
-        free(notes->src->lines);
-        notes->src->lines = NULL;
+        zfree(&notes->src->lines);
 }
 
 /* Get the filename:line for the colored entries */