BootAnimation: remove superfluous null check for `mAnimation`

The null check added in I603da080b1732a436a10dbaca6f2be9f158124dc makes
our static analyzer suspect that the call to
`playAnimation(*mAnimation)` dereferences null. The beginning of this
function establishes a non-null value for `mAnimation`, which is used
unconditionally throughout the function. Hence, this condition seems
unnecessary.

Bug: None
Test: TreeHugger
Change-Id: I0575df17df7f7e3018d99cafd9dcfcd3c10e5fbc
diff --git a/cmds/bootanimation/BootAnimation.cpp b/cmds/bootanimation/BootAnimation.cpp
index 7c81f09..90a5d49 100644
--- a/cmds/bootanimation/BootAnimation.cpp
+++ b/cmds/bootanimation/BootAnimation.cpp
@@ -1339,7 +1339,7 @@
         mTimeCheckThread->run("BootAnimation::TimeCheckThread", PRIORITY_NORMAL);
     }
 
-    if (mAnimation != nullptr && mAnimation->dynamicColoringEnabled) {
+    if (mAnimation->dynamicColoringEnabled) {
         initDynamicColors();
     }