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[as-z80] Copy always all the bytes from op buffer

Some times it works if you don't copy all the bytes, but in some
opcodes you need all the bytes.

--- a/as/target/x80/ins.c

+++ b/as/target/x80/ins.c

@@ -150,7 +150,7 @@

 	par1 = args[0];

 	par2 = args[1];

-	memcpy(buf, op->bytes, n-1);

+	memcpy(buf, op->bytes, n);

 	buf[n-1] = par2->sym->value;

 	buf[n-2] |= reg2int(par1->sym->argtype) << 3;

 	emit(buf, n);

@@ -173,7 +173,7 @@

 	par1 = args[0]->left;

 	par2 = args[1];

-	memcpy(buf, op->bytes, n-1);

+	memcpy(buf, op->bytes, n);

 	buf[n-1] = par1->sym->value;

 	buf[n-2] |= reg2int(par2->sym->argtype);

 	emit(buf, n);

@@ -189,7 +189,7 @@

 	par1 = args[0]->left;

 	par2 = args[1];

-	memcpy(buf, op->bytes, n-1);

+	memcpy(buf, op->bytes, n);

 	buf[n-1] = par1->sym->value;

 	buf[n-2] = par2->sym->value;

 	emit(buf, n);

@@ -204,7 +204,7 @@

 	par2 = args[1];

-	memcpy(buf, op->bytes, n-1);

+	memcpy(buf, op->bytes, n);

 	buf[n-1] = par2->sym->value;

 	emit(buf, n);

 }

@@ -219,7 +219,7 @@

 	par2 = args[1];

-	memcpy(buf, op->bytes, n-2);

+	memcpy(buf, op->bytes, n);

 	val = par2->sym->value;

 	buf[n-1] = val >> 8;

 	buf[n-2] = val;

@@ -287,7 +287,7 @@

 	par1 = args[0];

-	memcpy(buf, op->bytes, n-1);

+	memcpy(buf, op->bytes, n);

 	buf[n-1] |= reg2int(par1->sym->argtype) << 4;

 	emit(buf, n);

 }

@@ -303,7 +303,7 @@

 	par1 = args[0];

 	par2 = args[1];

-	memcpy(buf, op->bytes, n-1);

+	memcpy(buf, op->bytes, n);

 	val = par2->sym->value;

 	buf[n-1] = val >> 8;

 	buf[n-2] = val;