QNX: fix buffer creation

During some coding style cleanup in 02311c07 ("QNX: normalize braces")
some braces which were actually necessary got removed.

The result was an spurious report of a fatal error when no underlying
error condition had occurred.

This change restores the braces to preserve the prior behavior.

Change-Id: Ic32fbd5961ce59f6c01476fd2cef6fec0bdae93e
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
Prevent QOpenGLShaderProgram::link() from showing unnecessary warnings.

If the liking didn't fail there's no need to print out warnings. The
warnings can still be accessed by the application after calling link()
through the log() function.

This prevents warnings such as these from appearing:

QOpenGLShader::link: "No errors."

Task-number: QTBUG-31326
Change-Id: I03c9be5dfada8822c3ab1c3610eac2fc0a91410b
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>