Coverity fixes (#2901)

* Fix CID 643619
* Fix CID 645257

Author: Rot127

arch/RISCV/RISCVBaseInfo.c

@@ -39,11 +39,13 @@ typedef struct {
 	unsigned value;
 	bool isFractional;
 } VLMULDecodeResult;
+
 VLMULDecodeResult decodeVLMUL(RISCVII_VLMUL VLMUL)
 {
 	switch (VLMUL) {
 	default:
 		CS_ASSERT(0 && "Unexpected LMUL value!");
+		break;
 	case RISCVII_LMUL_1:
 	case RISCVII_LMUL_2:
 	case RISCVII_LMUL_4:
@@ -61,6 +63,8 @@ VLMULDecodeResult decodeVLMUL(RISCVII_VLMUL VLMUL)
 		return result;
 	}
 	}
+	VLMULDecodeResult result = { .value = 0, .isFractional = false };
+	return result;
 }
 
 void printVType(unsigned VType, SStream *OS)

tests/unit/riscv_op_count_iter.c

@@ -16,7 +16,10 @@ static bool test_riscv_op_count_no_stale()
 	static const int32_t expected_op_counts[] = { 2, 3, 2 };
 
 	csh handle;
-	cs_open(CS_ARCH_RISCV, CS_MODE_RISCV64 | CS_MODE_RISCV_C, &handle);
+	if (cs_open(CS_ARCH_RISCV, CS_MODE_RISCV64 | CS_MODE_RISCV_C,
+		    &handle) != CS_ERR_OK) {
+		return false;
+	}
 	cs_option(handle, CS_OPT_DETAIL, CS_OPT_ON | CS_OPT_DETAIL_REAL);
 	cs_option(handle, CS_OPT_SYNTAX,
 		  CS_OPT_SYNTAX_NO_ALIAS_TEXT |