miext: Remove if check which is always true

In both cases we check for width > 0 just above, and the variable is not
modified between the checks, so the condition is always true.

Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
4 jobs for remove-always-true-if in 4 minutes and 49 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Docker Image
passed #8325719
debian-buster

00:00:12

 
  Build And Test
passed #8325720
autotools

00:04:37

passed #8325721
meson

00:01:52

passed #8325722
meson-noglamor

00:01:18