Enable runtime/printf

This CL changes the single `sprintf` to an `snprintf` which allows the
runtime/printf lint check to be enabled.

Change-Id: Ieed654a8d5f23250e4bc8ee07001489a060f8dc5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86084
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>

src/dawn/CPPLINT.cfg

@@ -11,5 +11,4 @@ filter=-readability/namespace
 filter=-runtime/explicit
 filter=-runtime/indentation_namespace
 filter=-runtime/int
-filter=-runtime/printf
 filter=-whitespace/empty_if_body

src/dawn/tests/DawnTest.cpp

@@ -95,7 +95,7 @@ namespace {
             auto byteView = reinterpret_cast<const uint8_t*>(buffer + index);
             for (unsigned int b = 0; b < kBytes; ++b) {
                 char buf[4];
-                sprintf(buf, "%02X ", byteView[b]);
+                snprintf(buf, 4, "%02X ", byteView[b]);
                 result << buf;
             }
         }