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readtif: if getbit returns less than 0 during eol fill bits, return early

--- a/sys/src/cmd/jpg/readtif.c

+++ b/sys/src/cmd/jpg/readtif.c

@@ -672,8 +672,12 @@

 	if(f->eol == nil) {

 		if(f->eolfill) {

-			for(i = 0; i < 4; i++)

-				(*f->getbit)(f);

+			for(i = 0; i < 4; i++) {

+				if((*f->getbit)(f) < 0) {

+					f->st = -1;

+					return nil;

+				}

+			}

 		}

 		if((p = gettab(f, 0)) == nil || p->run >= 0) {

 			werrstr("first eol");

-- 

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