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Fix scans of more than one character in %[]

This got broken in d8e877a89dae, where we returned 0 on the
first mismatch; we want to return 0 only when we consumed no
characters.

--- a/sys/src/ape/lib/ap/stdio/vfscanf.c

+++ b/sys/src/ape/lib/ap/stdio/vfscanf.c

@@ -416,7 +416,7 @@

 		}

 		if(!match(c, pat)){

 			nungetc(c, f);

-			return 0;

+			goto Done;

 		}

 		if(store)

 			*s++=c;

@@ -424,5 +424,5 @@

 	}

 Done:

 	if(store) *s='\0';

-	return 1;

+	return nn > 0;

 }

--- a/sys/src/libstdio/vfscanf.c

+++ b/sys/src/libstdio/vfscanf.c

@@ -339,6 +339,7 @@

 	int c, nn;

 	register char *s;

 	register const char *pat;

+

 	pat=++fmtp;

 	if(*fmtp=='^') fmtp++;

 	if(*fmtp!='\0') fmtp++;

@@ -354,7 +355,7 @@

 		}

 		if(!match(c, pat)){

 			nungetc(c, f);

-			return 0;

+			goto Done;

 		}

 		if(store) *s++=c;

 		nn++;

@@ -361,5 +362,5 @@

 	}

 Done:

 	if(store) *s='\0';

-	return 1;

+	return nn > 0;

 }

-- 

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