Vulkan: fixes driver name concatenation on multi-GPU systems (#2620)

* Vulkan: fixes driver name concatenation on multi-GPU systems

applyDriverName appended to the result buffer without clearing it. When
a later device reported a higher API version, its driver name was
appended to the name of the earlier device instead of replacing it, as
the comment in detectVulkan intends.

* CHANGELOG: moves the #2615 entry to Unreleased

#2616 was opened after 2.69.0 had been released, but its entry was
written under 2.69.0 Bugfixes, so the changelog listed the fix as part
of 2.69.0.

CHANGELOG.md

@@ -6,6 +6,10 @@ Changes:
 Features:
 * Improved performance of LocalIP, NetIO and DNS on Windows
 
+Bugfixes:
+* Fixed external monitors detected via DDC/CI being randomly reported as built-in, and libddcutil trace messages occasionally leaking into the output and breaking `--format json`. (#2615, Brightness / Linux)
+* Fixed the Vulkan driver name being concatenated with the driver name of a previously enumerated device on systems with more than one GPU. (#2619, Vulkan)
+
 # 2.69.0
 
 Changes:
@@ -58,7 +62,6 @@ Features:
 
 Bugfixes:
 * Fixed Snapdragon X2 series model detection on Linux. (#2611, CPU / Linux)
-* Fixed external monitors detected via DDC/CI being randomly reported as built-in, and libddcutil trace messages occasionally leaking into the output and breaking `--format json`. (#2615, Brightness / Linux)
 * Fixed image logo caching, padding, and positioning issues, including an iTerm display bug. (Logo)
 * Fixed several Windows issues, including Windows Terminal font detection, redirected `--gen-config` output, and gamepad battery reporting for DualShock 4 and Switch controllers. (#2573, TerminalFont; Gamepad; General)
 * Fixed formatting and display issues, including ANSI-aware truncation, date/time formatting, and bright key/title colors. (Format / DateTime / Display)

src/detection/vulkan/vulkan.c

@@ -19,6 +19,8 @@ static inline void applyVulkanVersion(uint32_t vulkanVersion, FFVersion* ffVersi
 }
 
 static void applyDriverName(VkPhysicalDeviceDriverPropertiesKHR* properties, FFstrbuf* result) {
+    ffStrbufClear(result);
+
     if (!ffStrSet(properties->driverName)) {
         return;
     }