env: Rename setenv() to env_set()

We are now using an env_ prefix for environment functions. Rename setenv()
for consistency. Also add function comments in common.h.

Suggested-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index c9c79e0..e50c075 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -468,7 +468,7 @@
  *	    modified or deleted
  *
  */
-int fw_setenv(int argc, char *argv[], struct env_opts *opts)
+int fw_env_set(int argc, char *argv[], struct env_opts *opts)
 {
 	int i;
 	size_t len;
diff --git a/tools/env/fw_env.h b/tools/env/fw_env.h
index 04bb646..2d37eb5 100644
--- a/tools/env/fw_env.h
+++ b/tools/env/fw_env.h
@@ -44,7 +44,7 @@
 int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts);
 
 /**
- * fw_setenv() - adds or removes one variable to the environment
+ * fw_env_set() - adds or removes one variable to the environment
  *
  * @argc: number of strings in argv, argv[0] is variable name,
  *          argc==1 means erase variable, argc > 1 means add a variable
@@ -61,7 +61,7 @@
  * ERRORS:
  *  EROFS - some variables ("ethaddr", "serial#") cannot be modified
  */
-int fw_setenv(int argc, char *argv[], struct env_opts *opts);
+int fw_env_set(int argc, char *argv[], struct env_opts *opts);
 
 /**
  * fw_parse_script() - adds or removes multiple variables with a batch script
diff --git a/tools/env/fw_env_main.c b/tools/env/fw_env_main.c
index b8bff26..6e278ca 100644
--- a/tools/env/fw_env_main.c
+++ b/tools/env/fw_env_main.c
@@ -78,7 +78,7 @@
 		"\n");
 }
 
-void usage_setenv(void)
+void usage_env_set(void)
 {
 	fprintf(stderr,
 		"Usage: fw_setenv [OPTIONS]... [VARIABLE]...\n"
@@ -142,7 +142,7 @@
 			env_opts.lockname = optarg;
 			break;
 		case 'h':
-			do_printenv ? usage_printenv() : usage_setenv();
+			do_printenv ? usage_printenv() : usage_env_set();
 			exit(EXIT_SUCCESS);
 			break;
 		default:
@@ -202,7 +202,7 @@
 			/* ignore common options */
 			break;
 		default: /* '?' */
-			usage_setenv();
+			usage_env_set();
 			exit(EXIT_FAILURE);
 			break;
 		}
@@ -273,7 +273,7 @@
 			retval = EXIT_FAILURE;
 	} else {
 		if (!script_file) {
-			if (fw_setenv(argc, argv, &env_opts) != 0)
+			if (fw_env_set(argc, argv, &env_opts) != 0)
 				retval = EXIT_FAILURE;
 		} else {
 			if (fw_parse_script(script_file, &env_opts) != 0)