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[as] Fix type of fields in struct op

These fields must be unsigned or otherwise we can undesired sign
extension.

--- a/as/as.h

+++ b/as/as.h

@@ -67,7 +67,7 @@

 	unsigned char flags;

 	char size;

 	void (*format)(Op *, Node **);

-	char *bytes;

+	unsigned char *bytes;

 	unsigned char *args;

 };

--- a/as/target/gen.awk

+++ b/as/target/gen.awk

@@ -48,12 +48,12 @@

 			       opsize[i], opformat[i]

 			if (opbytes[i] != "")

-				printf "\t\t.bytes = (char []) {%s},\n",

+				printf "\t\t.bytes = (unsigned char []) {%s},\n",

 				        opbytes[i]

 			a = str2args(opargs[i])

 			if (a != "")

-				printf "\t\t.args = (char []) {%s}\n", a

+				printf "\t\t.args = (unsigned char []) {%s}\n", a

 			print "\t},"

 		}