PVS-Studio warning V517 for Chromium

static GLenum
get_temp_image_type(GLcontext *ctx, GLenum baseFormat)
{
  ...
  if (ctx->DrawBuffer->Visual.redBits <= 8)       <<<---
     return GL_UNSIGNED_BYTE;
  else if (ctx->DrawBuffer->Visual.redBits <= 8)  <<<---
     return GL_UNSIGNED_SHORT;
  else
     return GL_FLOAT;
  ...
}

This suspicious code was found in Chromium project by PVS-Studio static code analyzer.
Warning message is:
V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 2520, 2522. osmesa meta.c 2520

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/