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cpp: Improve switch in outcpp()

--- a/src/cmd/cc/cc1/cpp.c

+++ b/src/cmd/cc/cc1/cpp.c

@@ -818,9 +818,7 @@

 				goto print_str;

 			case '\a':

 				t = "\\a";

-			print_str:

-				fputs(t, stdout);

-				break;

+				goto print_str;

 			case '\\':

 				putchar('\\');

 			default:

@@ -829,6 +827,9 @@

 				else

 					putchar(c);

 				break;

+			print_str:

+				fputs(t, stdout);

+				break;

 			}

 		}

 		putchar(' ');

@@ -835,4 +836,3 @@

 	}

 	putchar('\n');

 }

-