perf script: Fix compiler warning in builtin_script.c:is_top_script()

Fix annoying compiler warning in the is_top_script() function.

The issue was that a const char * was cast into a char * to call
ends_with(). We fix the users of ends_with() instead. Some are passing a
char *, but it is okay to cast the return value of ends_with() to char *
(because we understand what ends_with() does).

Cc: David S. Miller <davem@davemloft.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@gmail.com>
LKML-Reference: <4cf92096.17edd80a.1540.5d60@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-script.c

@@ -387,10 +387,10 @@ out_delete_desc:
 	return NULL;
 }
 
-static char *ends_with(char *str, const char *suffix)
+static const char *ends_with(const char *str, const char *suffix)
 {
 	size_t suffix_len = strlen(suffix);
-	char *p = str;
+	const char *p = str;
 
 	if (strlen(str) > suffix_len) {
 		p = str + strlen(str) - suffix_len;
@@ -482,7 +482,7 @@ static int list_available_scripts(const struct option *opt __used,
 
 		for_each_script(lang_path, lang_dir, script_dirent, script_next) {
 			script_root = strdup(script_dirent.d_name);
-			str = ends_with(script_root, REPORT_SUFFIX);
+			str = (char *)ends_with(script_root, REPORT_SUFFIX);
 			if (str) {
 				*str = '\0';
 				desc = script_desc__findnew(script_root);
@@ -530,7 +530,7 @@ static char *get_script_path(const char *script_root, const char *suffix)
 
 		for_each_script(lang_path, lang_dir, script_dirent, script_next) {
 			__script_root = strdup(script_dirent.d_name);
-			str = ends_with(__script_root, suffix);
+			str = (char *)ends_with(__script_root, suffix);
 			if (str) {
 				*str = '\0';
 				if (strcmp(__script_root, script_root))
@@ -550,7 +550,7 @@ static char *get_script_path(const char *script_root, const char *suffix)
 
 static bool is_top_script(const char *script_path)
 {
-	return ends_with((char *)script_path, "top") == NULL ? false : true;
+	return ends_with(script_path, "top") == NULL ? false : true;
 }
 
 static int has_required_arg(char *script_path)