Mass replace error_msg("%s", "literal") -> error_msg("literal")

There is no need to print literal strings through "%s".
Only untrusted strings such as filenames need that.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/syscall.c b/syscall.c
index 120b19b..5bf2a12 100644
--- a/syscall.c
+++ b/syscall.c
@@ -1076,7 +1076,7 @@
 		errno = 0;
 		opcode = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(psw - sizeof(long)), 0);
 		if (errno) {
-			perror_msg("%s", "peektext(psw-oneword)");
+			perror_msg("peektext(psw-oneword)");
 			return -1;
 		}