s390/dis: use correct escape sequence for '%' character

The double escape character sequence introduced with commit
272fa59ccb4f ("s390/dis: Fix handling of format specifiers") is not
necessary anymore since commit 561e10300269 ("s390/dis: Fix printing
of the register numbers").

Instead this now generates an extra '%' character:

lg      %%r1,160(%%r11)

So fix this and basically revert 272fa59ccb4f.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/dis.c

@@ -1920,23 +1920,16 @@ static int print_insn(char *buffer, unsigned char *code, unsigned long addr)
 			}
 			if (separator)
 				ptr += sprintf(ptr, "%c", separator);
-			/*
-			 * Use four '%' characters below because of the
-			 * following two conversions:
-			 *
-			 *  1) sprintf: %%%%r -> %%r
-			 *  2) printk : %%r   -> %r
-			 */
 			if (operand->flags & OPERAND_GPR)
-				ptr += sprintf(ptr, "%%%%r%i", value);
+				ptr += sprintf(ptr, "%%r%i", value);
 			else if (operand->flags & OPERAND_FPR)
-				ptr += sprintf(ptr, "%%%%f%i", value);
+				ptr += sprintf(ptr, "%%f%i", value);
 			else if (operand->flags & OPERAND_AR)
-				ptr += sprintf(ptr, "%%%%a%i", value);
+				ptr += sprintf(ptr, "%%a%i", value);
 			else if (operand->flags & OPERAND_CR)
-				ptr += sprintf(ptr, "%%%%c%i", value);
+				ptr += sprintf(ptr, "%%c%i", value);
 			else if (operand->flags & OPERAND_VR)
-				ptr += sprintf(ptr, "%%%%v%i", value);
+				ptr += sprintf(ptr, "%%v%i", value);
 			else if (operand->flags & OPERAND_PCREL)
 				ptr += sprintf(ptr, "%lx", (signed int) value
 								      + addr);