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[lib/c] Fix test increment

It wasn't done in characters out of expansions.

--- a/lib/c/src/vfprintf.c

+++ b/lib/c/src/vfprintf.c

@@ -189,8 +189,8 @@

 	for (cnt = 0; ch = *fmt++; cnt += inc) {

 		if (ch != '%') {

 			putc(ch, fp);

-			++cnt;

-			continue;

+			inc = 1;

+			goto test_inc;

 		}

 		fill = ' ';

@@ -338,7 +338,7 @@

 			setcnt(va, flags, cnt);

 			break;

 		case '\0':

-			goto end_format;

+			--fmt;

 		}

 test_inc:

 		if (inc > INT_MAX - cnt) {

@@ -346,6 +346,6 @@

 			return EOF;

 		}

 	}

-end_format:

+

 	return (ferror(fp)) ? EOF : cnt;

 }