src/lib: Clean up general issues found by checkpatch.pl

Fix the following errors and warnings detected by checkpatch.pl:

ERROR: Bad function definition - void init_timer() should probably be void init_timer(void)
ERROR: Prefixing 0x with decimal output is defective
WARNING: Comparisons should place the constant on the right side of the test
WARNING: char * array declaration might be better as static const

TEST=Build and run on Galileo Gen2

Change-Id: I9f618eea95e1f92fa34f4f89da27c0b16ae7f4ee
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18763
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/lib/gcov-glue.c

@@ -114,7 +114,7 @@ static size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
 static size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
 {
 #if CONFIG_DEBUG_COVERAGE
-	printk(BIOS_DEBUG, "fwrite: %zd * 0x%zd bytes to file %s\n",
+	printk(BIOS_DEBUG, "fwrite: %zd * %zd bytes to file %s\n",
 		nmemb, size, stream->filename);
 #endif
 	// TODO check if file is last opened file and fail otherwise.