st/mesa: don't clobber glGetInternalformat* buffer for GL_NUM_SAMPLE_COUNTS

Applications might pass in a buffer that is sized too large and rely
on the extra space of the buffer not being overwritten.

Fixes dEQP-GLES31.functional.state_query.internal_format.partial_query.num_sample_counts

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
(cherry picked from commit 9a8f13a33b)

src/mesa/state_tracker/st_format.c

@@ -2373,9 +2373,10 @@ st_QueryInternalFormat(struct gl_context *ctx, GLenum target,
       break;
 
    case GL_NUM_SAMPLE_COUNTS: {
+      int samples[16];
       size_t num_samples;
       num_samples = st_QuerySamplesForFormat(ctx, target, internalFormat,
-                                             params);
+                                             samples);
       params[0] = (GLint) num_samples;
       break;
    }