perf tools: Refactor LLVM test warning for missing binary

The same warning is duplicated in two places so refactor it into a
single function "search_program_and_warn". This will be used a third
time in a later commit.

Signed-off-by: James Clark <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: [e-mail]
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/llvm-utils.c

···
 	.user_set_param = false,
 };
 
+static void version_notice(void);
+
 int perf_llvm_config(const char *var, const char *value)
 {
 	if (!strstarts(var, "llvm."))
···
 	}
 
 	free(env);
+	return ret;
+}
+
+static int search_program_and_warn(const char *def, const char *name,
+				   char *output)
+{
+	int ret = search_program(def, name, output);
+
+	if (ret) {
+		pr_err("ERROR:\tunable to find %s.\n"
+		       "Hint:\tTry to install latest clang/llvm to support BPF. Check your $PATH\n"
+		       "     \tand '%s-path' option in [llvm] section of ~/.perfconfig.\n",
+		       name, name);
+		version_notice();
+	}
 	return ret;
 }
 
···
 	if (!template)
 		template = CLANG_BPF_CMD_DEFAULT_TEMPLATE;
 
-	err = search_program(llvm_param.clang_path,
+	err = search_program_and_warn(llvm_param.clang_path,
 			     "clang", clang_path);
-	if (err) {
-		pr_err(
-"ERROR:\tunable to find clang.\n"
-"Hint:\tTry to install latest clang/llvm to support BPF. Check your $PATH\n"
-"     \tand 'clang-path' option in [llvm] section of ~/.perfconfig.\n");
-		version_notice();
+	if (err)
 		return -ENOENT;
-	}
 
 	/*
 	 * This is an optional work. Even it fail we can continue our
···
 	force_set_env("WORKING_DIR", kbuild_dir ? : ".");
 
 	if (opts) {
-		err = search_program(llvm_param.llc_path, "llc", llc_path);
-		if (err) {
-			pr_err("ERROR:\tunable to find llc.\n"
-			       "Hint:\tTry to install latest clang/llvm to support BPF. Check your $PATH\n"
-			       "     \tand 'llc-path' option in [llvm] section of ~/.perfconfig.\n");
-			version_notice();
+		err = search_program_and_warn(llvm_param.llc_path, "llc", llc_path);
+		if (err)
 			goto errout;
-		}
 
 		err = -ENOMEM;
 		if (asprintf(&pipe_template, "%s -emit-llvm | %s -march=bpf %s -filetype=obj -o -",