Semihosting 2 of 3: Cosmetic improvements

Cosmetic, non-functional improvements
in `riscv_semihosting_detect_magic_sequence()`.

Change-Id: I935d3847749a02e4f579900a0971c30a5cc826b7
Signed-off-by: Jan Matyas <jan.matyas@codasip.com>

src/target/riscv/riscv_semihosting.c

@@ -53,12 +53,13 @@ static int riscv_semihosting_detect_magic_sequence(struct target *target,
 
 	/* Read three uncompressed instructions:
 	 * The previous, the current one (pointed to by PC) and the next one. */
+	const target_addr_t sequence_start_address = pc - 4;
 	for (int i = 0; i < 3; i++) {
 		uint8_t buf[4];
 
 		/* Instruction memories may not support arbitrary read size.
 		 * Use any size that will work. */
-		const target_addr_t address = (pc - 4) + 4 * i;
+		const target_addr_t address = sequence_start_address + (4 * i);
 		int result = riscv_read_by_any_size(target, address, 4, buf);
 		if (result != ERROR_OK) {
 			*sequence_found = false;
@@ -67,7 +68,7 @@ static int riscv_semihosting_detect_magic_sequence(struct target *target,
 
 		const uint32_t value = target_buffer_get_u32(target, buf);
 
-		LOG_TARGET_DEBUG(target, "compare 0x%08x from 0x%" PRIx64 " against 0x%08x",
+		LOG_TARGET_DEBUG(target, "compare 0x%08" PRIx32 " from 0x%" PRIx64 " against 0x%08" PRIx32,
 			value, address, magic[i]);
 		if (value != magic[i]) {
 			LOG_TARGET_DEBUG(target, "Not a RISC-V semihosting sequence");