Remove redundant unsigned integer overflow tests

Bug: b/371615496
Change-Id: I28df888942085138a54e18c7e939300d959c68b0
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5914872
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
diff --git a/source/scale_rgb.cc b/source/scale_rgb.cc
index 2ba7b79..8bc576c 100644
--- a/source/scale_rgb.cc
+++ b/source/scale_rgb.cc
@@ -44,7 +44,7 @@
     return -1;  // Invalid size.
   }
   const uint64_t argb_size = src_argb_size + dst_argb_size;
-  if (argb_size < src_argb_size || argb_size < dst_argb_size || argb_size > SIZE_MAX) {
+  if (argb_size > SIZE_MAX) {
     return -1;  // Invalid size.
   }
   uint8_t* src_argb = (uint8_t*)malloc((size_t)argb_size);