powerpc/crash: remove unnecessary NULL check before kvfree()

Fix the following coccicheck build warning:

arch/powerpc/kexec/crash.c:488:2-8: WARNING: NULL check before some
freeing functions is not needed.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Sourabh Jain <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

Author: sourabhjains

arch/powerpc/kexec/crash.c

@@ -484,8 +484,7 @@ static void update_crash_elfcorehdr(struct kimage *image, struct memory_notify *
 	}
 out:
 	kvfree(cmem);
-	if (elfbuf)
-		kvfree(elfbuf);
+	kvfree(elfbuf);
 }
 
 /**