perf top: Remove needless malloc(0) call that triggers -Walloc-size

GCC 14 introduces a new -Walloc-size included in -Wextra which errors out
like:

  builtin-top.c: In function ‘prompt_integer’:
  builtin-top.c:360:21: error: allocation of insufficient size ‘0’ for
  type ‘char’ with size ‘1’ [-Werror=alloc-size]
    360 |         char *buf = malloc(0), *p;
        |                     ^~~~~~

Just set it to NULL, getline() will do the allocation.
Signed-off-by: Sun Haiyong <sunhaiyong@loongson.cn>
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20231204082055.91877-1-siyanteng@loongson.cnSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-top.c

@@ -357,7 +357,7 @@ static void perf_top__print_sym_table(struct perf_top *top)
 
 static void prompt_integer(int *target, const char *msg)
 {
-	char *buf = malloc(0), *p;
+	char *buf = NULL, *p;
 	size_t dummy = 0;
 	int tmp;