[PATCH] perf ftrace: Fix NULL vs IS_ERR() check in prepare_func_profile()

The hashmap__new() function never returns NULL, it returns error
pointers. Fix the error checking to match.

Fixes: 0f223813edd0 ("perf ftrace: Add 'profile' command")
Signed-off-by: Chen Ni <redacted>
---
 tools/perf/builtin-ftrace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 6b6eec65f93f..9e7e81a08606 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c

@@ -18,6 +18,7 @@
 #include <poll.h>
 #include <ctype.h>
 #include <linux/capability.h>
+#include <linux/err.h>
 #include <linux/string.h>
 #include <sys/stat.h>

@@ -1209,7 +1210,7 @@ static int prepare_func_profile(struct perf_ftrace *ftrace)
        ftrace->graph_verbose = 0;

        ftrace->profile_hash = hashmap__new(profile_hash, profile_equal, NULL);
-       if (ftrace->profile_hash == NULL)
+       if (IS_ERR(ftrace->profile_hash))
                return -ENOMEM;