binutils test pr25662: don't use single character labels

[Alan Modra]

This fixes the test for z80, which predefine register symbols "a" and
"c" among others.

	* testsuite/binutils-all/pr25662.s: Replace "a" with "aaa" and
	"c" with "ccc" labels.

diff --git a/binutils/testsuite/binutils-all/pr25662.s b/binutils/testsuite/binutils-all/pr25662.s
index 0b4db05026f..8b3594b68a6 100644
--- a/binutils/testsuite/binutils-all/pr25662.s
+++ b/binutils/testsuite/binutils-all/pr25662.s
@@ -21,11 +21,11 @@
    to run this testcase for other file formats.  */
 
 	.section .bss
-a:
+aaa:
 	.zero	0x2
 
 	.section .data
-c:
+ccc:
 	.zero	0x201
 
 	.section .text

-- 
Alan Modra
Australia Development Lab, IBM