Resolve the build warning by initializing load_size

Bug: 312314396
Test: TH
Change-Id: Ic5c4835a2e33eea1f1942602cb6e969a730f8337
diff --git a/v5/apf_interpreter.c b/v5/apf_interpreter.c
index 9284a45..ee8a28e 100644
--- a/v5/apf_interpreter.c
+++ b/v5/apf_interpreter.c
@@ -154,7 +154,7 @@
                   offs += registers[1];
               }
               ASSERT_IN_PACKET_BOUNDS(offs);
-              uint32_t load_size;
+              uint32_t load_size = 0;
               switch (opcode) {
                   case LDB_OPCODE:
                   case LDBX_OPCODE: