Add -Wall to CFLAGS and fix warnings

Author: erikd

Makefile

@@ -1,5 +1,5 @@
 VERSION ?= $(shell git describe --tags --dirty)
-CFLAGS = -Wextra -DVERSION=\"$(VERSION)\" -g
+CFLAGS = -Wall -Wextra -DVERSION=\"$(VERSION)\" -g
 
 .PHONY: earlyoom
 earlyoom:

kill.c

@@ -83,7 +83,7 @@ static struct procinfo get_process_stats(int pid)
 		p.exited = 1;
 		return p;
 	}
-	fscanf(f, "%*lu %lu", &(p.vm_rss));
+	fscanf(f, "%*u %lu", &(p.vm_rss));
 	fclose(f);
 
 	return p;

main.c

@@ -128,7 +128,7 @@ int main(int argc, char *argv[])
 			if (m.SwapTotal > 0)
 				swap_free_percent = m.SwapFree * 100 / m.SwapTotal;
 
-			printf("mem avail: %lu MiB (%d %%), swap free: %lu MiB (%d %%)\n",
+			printf("mem avail: %lu MiB (%ld %%), swap free: %lu MiB (%d %%)\n",
 				m.MemAvailable / 1024, m.MemAvailable * 100 / m.MemTotal,
 				m.SwapFree / 1024, swap_free_percent);
 			c=0;

meminfo.c

@@ -32,6 +32,7 @@ static long get_entry_fatal(const char *name, const char *buf) {
 		fprintf(stderr, "Could not find \"%s\"\n", name);
 		exit(104);
 	}
+	return val;
 }
 
 /* If the kernel does not provide MemAvailable (introduced in Linux 3.14),