staging: fbtft: Add check on strlcpy() return value

Return value of strlcpy() is not checked. Name string is silently
truncated if longer that SPI_NAME_SIZE, whilst not detrimental to
the program logic it would be nice to notify the user. Module is
currently quite verbose, adding extra pr_warn() calls will not overly
impact this verbosity.

Check return value from call to strlcpy(). If source string is
truncated call pr_warn() to notify user.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fbtft/fbtft_device.c

@@ -1483,7 +1483,13 @@ static int __init fbtft_device_init(void)
 			displays[i].pdev->name = name;
 			displays[i].spi = NULL;
 		} else {
-			strlcpy(displays[i].spi->modalias, name, SPI_NAME_SIZE);
+			size_t len;
+
+			len = strlcpy(displays[i].spi->modalias, name,
+				SPI_NAME_SIZE);
+			if (len >= SPI_NAME_SIZE)
+				pr_warn("modalias (name) truncated to: %s\n",
+					displays[i].spi->modalias);
 			displays[i].pdev = NULL;
 		}
 	}