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fltfmt: make %g print decimal numbers less than 1 with a leading zero

--- a/sys/src/libc/fmt/fltfmt.c

+++ b/sys/src/libc/fmt/fltfmt.c

@@ -205,7 +205,7 @@

 		if(xadd(s1, c2, 5))

 			e++;

 		if(e >= -4 && e <= prec) {

-			c1 = -e - 1;

+			c1 = -e;

 			c4 = prec - e;

 			chr = 'h';	// flag for 'f' style

 		}