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fix printing a char from a string that starts with a rune

--- a/sys/src/cmd/awk/run.c

+++ b/sys/src/cmd/awk/run.c

@@ -960,8 +960,10 @@

 					*p++ = '\0';

 					*p = '\0';

 				}

-			} else

-				sprint(p, fmt, getsval(x)[0]);

+			} else {

+				*p++ = getsval(x)[0];

+				*p = 0;

+			}

 			break;

 		}

 		if (istemp(x))

-- 

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