Fix buffer overflow when trying to display long GitVersion

Author: Nicole Faerber

src/main.c

@@ -119,6 +119,8 @@ int main(void) {
 	printf("\nRunning on an %s", buf);
 
 	len = snprintf(buf, sizeof(buf), "%s", Version_GetGitVersion());
+	if (len > 21)
+		len = 21;
 	LCD_disp_str((uint8_t*)buf, len, 128 - (len * 6), 0, FONT6X6);
 
 	LCD_FB_Update();
@@ -349,6 +351,8 @@ static int32_t Main_Work(void) {
 		LCD_disp_str((uint8_t*)buf, len, LCD_ALIGN_CENTER(len), 0, FONT6X6);
 
 		len = snprintf(buf, sizeof(buf), "%s", Version_GetGitVersion());
+		if (len > 21)
+			len = 21;
 		LCD_disp_str((uint8_t*)buf, len, LCD_ALIGN_CENTER(len), 64 - 6, FONT6X6);
 
 		LCD_BMPDisplay(stopbmp, 127 - 17, 0);