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libjson: fix mistake in unicode handler (thanks cinap)

--- a/sys/src/libjson/json.c

+++ b/sys/src/libjson/json.c

@@ -127,9 +127,9 @@

 						c = getch(l);

 						r *= 16;

-						if(c > '0' && c < '9') r += c - '0';

-						else if(c > 'a' && c < 'f') r += c - 'a' + 10;

-						else if(c > 'A' && c < 'F') r += c - 'A' + 10;

+						if(c >= '0' && c <= '9') r += c - '0';

+						else if(c >= 'a' && c <= 'f') r += c - 'a' + 10;

+						else if(c >= 'A' && c <= 'F') r += c - 'A' + 10;

 					}

 					break;

 				case 't':

-- 

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