mgmt/mcumgr/lib: Make version string work with CONFIG_NEWLIB_LIBC

By default the newlib does not compile with %hhu processing,
to avoid turning on additional options for newlib compilation
this commit changes formatting string to use %hu instead.
The commit fixes problem with malformed version string being
returned, by smp_svr, when CONFIG_NEWLIB_LIBC=y is set together
with CONFIG_NEWLIB_LIBC_NANO=y.

Fixes #45261

Signed-off-by: Dominik Ermel <[email protected]>

Author: de-nordic

subsys/mgmt/mcumgr/lib/cmd/img_mgmt/src/img_mgmt_util.c

@@ -16,8 +16,9 @@ img_mgmt_ver_str(const struct image_version *ver, char *dst)
 	int rc = 0;
 	int rc1 = 0;
 
-	rc = snprintf(dst, IMG_MGMT_VER_MAX_STR_LEN, "%hhu.%hhu.%hu",
-		ver->iv_major, ver->iv_minor, ver->iv_revision);
+	rc = snprintf(dst, IMG_MGMT_VER_MAX_STR_LEN, "%hu.%hu.%hu",
+		(uint16_t)ver->iv_major, (uint16_t)ver->iv_minor,
+		ver->iv_revision);
 
 	if (rc >= 0 && ver->iv_build_num != 0) {
 		rc1 = snprintf(&dst[rc], IMG_MGMT_VER_MAX_STR_LEN - rc, ".%u",