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Only output a single error with charmaps

--- a/src/asm/asmy.y

+++ b/src/asm/asmy.y

@@ -1004,10 +1004,8 @@

 			if ((value & 0xFF) != value)

 				warning(WARNING_TRUNCATION, "Expression must be 8-bit");

-			if (charmap_Add($2, value & 0xFF) == -1) {

-				fprintf(stderr, "Error parsing charmap. Either you've added too many (%i), or the input character length is too long (%i)' : %s\n", MAXCHARMAPS, CHARMAPLENGTH, strerror(errno));

-				yyerror("Error parsing charmap.");

-			}

+			if (charmap_Add($2, value & 0xFF) == -1)

+				yyerror("Error parsing charmap. Either you've added too many (%i), or the input character length is too long (%i)' : %s\n", MAXCHARMAPS, CHARMAPLENGTH, strerror(errno));

 		}

 ;