tty/nozomi: cleanup DUMP() macro

Replace snprint() with strscpy() and use min_t() instead of
the conditional operator to clamp buffer length.
Signed-off-by: NJoey Pabalinas <joeypabalinas@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/nozomi.c

@@ -72,19 +72,19 @@ do {							\
 
 #define TMP_BUF_MAX 256
 
-#define DUMP(buf__,len__) \
-  do {  \
-    char tbuf[TMP_BUF_MAX] = {0};\
-    if (len__ > 1) {\
-	snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
-	if (tbuf[len__-2] == '\r') {\
-		tbuf[len__-2] = 'r';\
-	} \
-	DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
-    } else {\
-	DBG1("SENDING: '%s' (%d)", tbuf, len__);\
-    } \
-} while (0)
+#define DUMP(buf__, len__)						\
+	do {								\
+		char tbuf[TMP_BUF_MAX] = {0};				\
+		if (len__ > 1) {					\
+			u32 data_len = min_t(u32, len__, TMP_BUF_MAX);	\
+			strscpy(tbuf, buf__, data_len);			\
+			if (tbuf[data_len - 2] == '\r')			\
+				tbuf[data_len - 2] = 'r';		\
+			DBG1("SENDING: '%s' (%d+n)", tbuf, len__);	\
+		} else {						\
+			DBG1("SENDING: '%s' (%d)", tbuf, len__);	\
+		}							\
+	} while (0)
 
 /*    Defines */
 #define NOZOMI_NAME		"nozomi"