Fix some signed overflow bugs

In the macros for the PDF blend modes, two comp1_t variables are
multiplied together and then used as if the result were a
comp4_t. When comp1_t is a uint8_t, this is fine because they are
promoted to int, and the product of two uint8_ts fits in an
int. However, when comp1_t is uint16, the product does not necessarily
fit in an int, so casts are necessary.

Fix for bug 43906, reported by Siarhei Siamashka.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/blitters-test.c b/test/blitters-test.c
index 55b6c735..63162e63 100644
--- a/test/blitters-test.c
+++ b/test/blitters-test.c
@@ -424,6 +424,6 @@ main (int argc, const char *argv[])
     }
 
     return fuzzer_test_main("blitters", 2000000,
-			    0x29137844,
+			    0x3EDA4108,
 			    test_composite, argc, argv);
 }